Some less important notes
I verry strongly believe that Miele just took the 8kg labeling straight from the EU machines to convince their focus group (appartment dwelling couples in the big city) that these machines are big enough for them.
Lot's of them will come from washers twice the capacity and wouldn't belive a more realistic loading suggestion (13 instead of 17.6 lbs) would be enough for them. Most people don't even know how much laundry 18lbs actually is.
You can easily imagine the volume of laundry we are talking about here. For ease of argument this is in kg.
A shirt (be it T-Shirt or dress shirt) up to XXL should rarely exceed 200g. So 1kg laundry contains 5 shirts.
So 8kg (17.6lbs) is about 40 shirts.
I don't even own that many T-Shirts.
To give you a more visual idea of the size of the machine I searched for this old video by German washer collector Maturasigma.
This is a Bosch washer, but the drum of this particular machine is 65l like the W1 drum AFAIK.
The load he has is supposedly 6.8kg of mixed whites. Just watch how much he has to pack it:
Now, this machine performs horribly with a load this full, but it was one of the first machines of that generation and was made long before the EU energy label reform in the early 2010s.
These machines have been improofed dramaticly while keeping the same drum volume.
This playlist by another German guy shows several different loads in his Bosch with a 65l drum of a pretty current iteration:
Just a visual aid.
Miele of course took note and can handle 8kg on cycles that allow that with no trouble.
Or, a reverse example.
Whirlpool brought 3 early Duets to the German market. The first generation was a verry early one and labeled 8kg, the next 2 were in quick succession and shipped until 2012 IIRC. Those were labeled 11kg. Then they were discontinued.
Now there is a LG model on offer in Germany labeled 17kg (that would be 37.5lbs round about) that is a clone of a last gen US machine.
Comparing the dimensions, it should have a 4.5cuft drum (128l about).
So, current machines are all labeled to about the same standards in the EU.
65l gets you 18 pounds, twice that twice that.
Here's a link to the German LG product site (don't be confused by the mini washer pictured with it, that is completly seperate, so just the frontloader alone is 17kg):
https://www.lg.com/de/waeschepflege/lg-F11WM17VT2
Now onto your programming questions:
Sadly Miele ditched Water Plus for the US, yes. There is an extra rinse option avaible under further option straight from the factory though.
There is an option to generally increase the water level for ALL rinses in ANY programm to the maximum allowed water level (should be 1/3rd to 1/2th way up the door) in the user accesible settings menu.
That dosen't add much time unless you have low water pressure.
However, that means EVERY rinse runs at max water level no matter how big the load (not sure if that is true for SingleWadh though). So, every rinse uses 20-30l (5.3 to 8gal). Given some cycles have up to 4 rinses possibly, that additional water adds up, especially on partial loads.
Further in the user acessible settings there is a cool down function which adds some cold water at the end of the main wash when ever Hot+ or Sanitize is selected as temperature. That can help with rinsing by diluting the wash water before the interim spin.
Ontop of that there is the bleach function in the settings menu. That flushes the prewash\bleach compartment 10min before the end of the main wash. As far as I understand, once you activated, that is active on several cycles that allow bleaching and only if you do not run a prewash no matter which temperature.
No idea how much water it adds though.
Activating the prewash option turns that off as far as I understand and turns the prewash compartment into a pre wash compartment again for every cycle a prewsh is selected.
Not sure, but that might add some time and possibly a nother rinse as well. But that are just assumptions, that option is new to the US version for W1s.
AFAIK there should still be an Allergy option in the hidden service menu.
On the last gen before the first W1s, that extended the interim spins, added some water and some time to each rinse and added another rinse to many cycles.
That might be different on W1s.
HOWEVER the only time I remember an Allergy option being mentioned in conjunction with a W1 machine was on one of the models Amazon review page where a 1 Star reviewer had constant suds issues with even the smallest dosages set in the AutoDos settings and both Water Plus adding another rinse and adding the most water it can as well as maximum rinse level activated. Miele service activated the Allergy option in the service menu but he still had the issue, so since that was the only time I ever red about something like this I was assuming that was a singled out issue and he either did something else wrong or his machine was a dud.
FURTHERMORE the US machines are from the generation that is just being introduced to the EU during the past couple months.
So there are verry few reviews and general knowledge about these machines of this most current generation, so it might well be that they slashed the service menu down a bit and there is no Allergy mode anymore.
Oh, and on top of that, there might be the question of how you even get into the service menu via a button combination.
Calling a Miele service technician out to activate that option might run you 200$ or more, so that only makes sense as a DIY job.
But I personaly don't even know how you get into the service menu on the W1s with a physical start button and a on/off button.
These most current machines only have touchpads and turn on via the programm selector IIRC.
And as these are even new over here where they are comming from and have a far bigger market, it will take some time until the procedure becomes public knowledge.
On the other hand though, it might be the same procedure as always just with the start touch pad and turning the dial to the normal cycle.
On the display temperature thing:
First off, in the settings menu, you can choose either clear text or rpm with either °C or °F as display layout.
I do assume that that might even give you more spin speed choices (the EU machines can select spin speeds in 100rpm steps instead of the 5 levels or so Miele gave names).
They have changed their temperature labeling to be more along the lines of what the US is used to.
Hot is now 50C (120F or so), probably due to the idea that most water heaters are not set higher than 140F and thus it is hard to get more than 120F in a washer without a heater.
And probably there were a few people who thought "Verry warm" was just a little bit warmer warm when it actually was more like "pretty hot" and damaged some of their clothing. Labeling 120F as hot would make that less likely, and to avoid negative terminology, they didn't call it hot - or eco hot.
Oh, and that might make US usage testing more efficent as hot now is cooler.
As these displays are ripped straight from the EU machines the temperature display sector probably can't handle more than 8 characters displayed (Sanitize has 8 letters and the manual spells is out). For ease of use, spin speed and temperature selection do not lead in a seperate sub menu any more (lot's of people hated that about the previous W1 machines with 1 or 4 line displays; when ever you selected a different temperature, you had to confirm with ok to go back into the normal display where temp, spin and estimated time were displayed together), so no clear text temperature selection can be longer than 8 characters including spaces.
So while spelling out Hot+ would have worked, Warm+ would have been to long, so they just used the + sign.
That entirety moved Warm from 40C to 30C (104F down to 86F) which makes efficency testing even better.
Now, the QuickIntense wash will be fairly simmilar to the EU QuickPowerWash (smaller heater, but there for hot fill).
In the EU, that cycle only has a 40C/104F or 60C/140F selection as well IIRC.
My theory behind that goes as follows:
They wanted a verry easy to proof and verry scientific way to market that cycles cleaning abilitys in the EU. There were many 1h cycles, but non claimed any cleaning ability to a scientificly set standard (I think some used independent laboratory tested claims, which more often than not are bought or have testing protocols which aren't public) and I think there aren't any other that do to this day.
So, I think what they did was using the EU energy label testing protocol, ignoring any efficency ratings and just testing within the standards for cleaning ability.
They used the cycles max design capacity (5kg) for testing in any of the testing protocol cycles (60C full load, 60C half load and 40C half load) and just ran a 40C full load as close as possible to the norm tests as well.
That way, they had an EU standard set by law to compare to. That makes pretty good marketing material.
But to do that, the cycles had to be verry precise in terms of timing and temperature control. For example, to maintain the 1h claim, it would be a verry wise idea to shorten the cycle once the washer hits temperature, but you can't shorten it to the same time every time as you need to have a minimum time of agitation both total and at temp to maintain the A-class cleaning claim.
So, instead of rewriting them entirely for the US to allow for cold washes and such, they just didn't.
Not sure why they excluded 50C/120F though. Up until last gen, the EU manual all listed 40°/60°, but the new models' manuals now show 40°-60°, so you might be abled to select 50° over here now.
For the US, they just copied a lot of cycles I would suppose, even in ways quite unusual (like allowing a Delicates wash in the US to go up to 140F).
Probably the most different cycles will be cottons and wrinkle-free.
75C (about 170F) is only avaible on the Sanitize setting and is now called "Sanitize" as temperature.
Even with hot fill, QuickIntense would be way to short to hit that temperature.
Starting out at - let's say - 120F after filling (which is optimistic), that would probably be not enough.
A good rule of thumb for the EU is that with 2000W of heating power, you can heat a 5-6kg (11-13lbs) wash load about 1°C in 1min.
For the US market, accounting for the difference in heater design and checking that data against common Sanitize cycle loads and times, that equates to a rule of thumb of 1°F per 1min for most sanitize cycles as they usually do allow loads in that range.
Now, even if the washer would be abled to fill with water so hot that it equates to 120F read by the machines NTC that would still mean 50min to an hour of heating.
Hard to do in a 1h cycle.
In the EU, the main wash of QuickPowerWash is about 40min long. The rest is for rinsing and spinning.
Assuming the US QuickIntense wash is fairly simmilar, it could heat the water 40F if it would heat immediatly, so realisticly more like 30-35F.
That would allow the washer to fill with water as low as 100°F when 140F is selected and it would still manage a temperature nobody could really tell apart from what they had selected without actually measuring the temperature.
Now, onto your point about why the home machines don't work like the professional machines.
These examples are all in relation to the PW6080 and its not fully programmable control.
(In Mieles Professional laundry lineup, "fully programmable" means you can actually create your own programs step by step with free reign over everything within safety limits, like you can't turn off out of balance controll, the maximum water levels are limited to the maximum design niveau for normal operation etc.)
First off, a cycle on the "professional" machine can be designed far simpler.
You see, the OctoPlus 8kg machine comes with AT LEAST 3.8kW heating power, usually it is 4.2-5kW heating power.
It can wash 8kg of laundry at a true 140F in 59min WITHOUT a hot water conection.
A hot water connection cuts that down to 53min.
At such high heating powers in relation to load size, most professional washers don't have to bother about heating times. They just estimate how long heating takes, and add that to the programmed wash time. Then they either stall the timer or just jump down as needed, but even if they have to, their cycle time estimates can't be off by more than 5-10 minutes.
(Miele solved that verry smartly on their older industrial machines with countdown displays: during prewash and while heating in the main wash, the washer would only display the current temperature in the display (indicated by a LED on the side of the display). Once heated, the display would switch over to residual time. As the wanted wash time after reaching temp was the same for every temperature within a cycle, programming the display output was verry simple and accurate, independent of the machine being connected to hot\cold or cold fill only.)
A household machine designed for cold fill only does that a little bit in reverse.
While there is verry little difference in the temperature of a cold fill (once its 20C, once 15C), the distance it has to heat is far greater.
As heating time is significantly longer, there is a big difference in how you have to design not only your wash cycle but how to handle rest time displays.
And with household washers being smaller, a truly full load needs much more agitation time than a truly full load in a commercial washer (keep in mind the compact Miele W1s have the same rated capacity as the PW6080).
Actually, after heating, a commercial washer basicly always has the same agitation time regardless of detected load size.
Thus, just having one basic Cotton cycle with one timetabel for all temperatures up to 60C is fine and still gives consistent wash results with pretty exact time estimates.
A household machine basicly needs a sperate timetable for every temperarture of any cycle.
Though Miele once did it. The precoursor to the PW6080 interface was used on a home-grade machine in the EU in the early 2000s.
It was the TOL model called "Navitronic" and featured a household set of cycles all with temperatures selectable in 5C increments.
But, as it turns out, most customers don't really care about a 45C wash and - for the most part - your laundry didn't either.
30C, 40C, 60C and for the EU something labeled 90C or such (that has to reach at least 80C though) is really all you need to clean anything.
30C: Woolens, Silks and lightly soiled sensitive colors don't go above that.
At 40C, enzyme action shifts into high gear, thus perfect for good cleaning with little bleaching action (daily-wear items with colors). Even most more delicate synthetic items are perfectly fine at this temperature.
At 60C, bleaching is in high gear and everyday hygenic needs are met. Most colored cotton fibres survive that temperarture with reasonably little fadeing (as long as a detergent without bleaching agent is used), most whites get perfect at that temperature (as long as you have a bleaching agent present) and most normal synthetics survive this wash as long as they are cooled down before spinning.
At 70C or above, only specific items could be washed. Only verry resistant cotton fibres and specialy designed synthetic items would survive this wash which has verry high removal rate of bacteria and such and has a verry intense bleaching action.
Then they added some more temps where the UI wouldn't get cloutered with them.
For example, Miele had a 50C Easy Care cycle for some time on their 1-dial selection machines of the late 90s early 2000s along with a 75C cottons cycle, both ment as economy options to the hottest temps in the respective cycle.
Once the temperature selection split off of the main cycle selection again, temperatures between 60C and 90C got more common again and Miele added 50C to their cotton cycles.
However, I can't remember any machine that did not allow you to change the temperature via a dial (main control dial on the Navitronic\Professional line or temperature dial on older machines) to have a 5°C stepping as that would either be to many programms to fit onto one dial or to tidious to cycle through by pressing a button.