It's impossible to compare British (or Brazilian) customers that are used to spin dryers to Americans.... Specially millennials.
Almost every day we receive emails of people saying it's false advertising because it doesn't "dry" the clothes completely.
I am even studying the possibility of simply change the name to "clothes centrifuge", because the word "dryer" makes millennials understand the clothes will come out 100% dry, fluffy, warm, probably ironed and folded.
Regarding the hose/pump, first there is the cost situation. the competition is really tight. not only the production costs, but also the shipping costs are higher. Also, thinking better now, when you said "rinse", the cost isn't only the pump. it involves several internal components and redesign the sump, with a seal... then add the seal, one more part to fail, blah, blah, blah, open new molds (absurd cost), then make the pump fit in the body (there's no space for it, so add 1 or 2 inches to the product height, then it will change the container layout and probably one layer of boxes won't fit (container is on the limit), so the shipping cost (Brazil-USA) per unit will be higher. If I add a pump i can estimate probably more $60 or $70 to the MSRP, not only $20. And profit margin the same, minimal.
If i have a spin dryer that costs 200 and has a drain pump and comes with 3-year full warranty and a competitor (chinese crap) that costs 198 and no drain pump and come with an incredible 90-day warranty, because of silly $2, customers will buy the inferior model.
So drain pump is a giant no, no, no F-word present continuous way.
Most people that buy at amazon don't read the product description they just read the tile, some description and hit add to cart. Then they return saying it wasn't what they're wanting to buy.
The second reason is the hose itself... people think it is a horrible, absurd, outrageous chore to clamp a hose and also if they have a hose hanging on the product. Everybody here knows how a regular spin dryer spout is... we have hundreds of emails and call logs from customer complaining about the previous model LD 6.3, because the spout was taking "an absurd space" in their closets... Imagine if I add a hose... gosh, they will come to my office only to shoot my head.
People complain about everything they can. It was created an image that the customer is not only always right, but they MUST find a reason to complain only because they are paying.
Please go to amazon and read the reviews... specially the negative ones. And get ready, because your eyes are going to roll a lot.
Remember this is a country that had to invent tide pods because dosing detergent will make an arm fall. Here we even have a "scent-free" scent booster (downy unstoppables) and people buy. (and then complain the perfume is not strong.)
Now tell me, why would somebody use a scent "booster" that is scent free?
WonderWash... our best seller ever... non electric, hand crank washing machine... at least once a week i receive an email with an innovative idea: add an electric motor to the WonderWash. Gosh, how could i be so dumb? Why didn't I think about it before? I should have learned that if i add an electric motor to a non electric washing machine people wont have to spin a crank... Should I also include automatic fill and drain? Maybe a spin cycle? Why not 48 different cycles and 20 different water levels? Maybe add a IOT feature? great... a WIFI wonderwash that you can control using an app on your phone (and also compatible with Alexa and Siri, of course)