Yesterday frontloaders vs today ones
Let's try to make out why older FL use(d) higher water levels.
1) Most of vintage water level sensors weren't so accurate as modern ones. In case of a very adsorbant load (e.g. terry towelling) many machines didn't sense the level had dropped down because of the high adsorbancy. So the trick was to use high levels.
The same trick is used in some laundromats. Owners want their washers free as faster as possible, to have more customers on each washer (higher productivity). High levels saturate loads faster and are "forgiving" on "overloads"
2) Mrs Average Housewife felt guilty to run the washer if it was not totally loaded (sometimes overloaded...). Go figure "delicate" cycle was considered a waste of water/energy cause the machine can be loaded only up to one third of the cylinder, so many people kept on using "elbow grease" cycle
In the last 20 years EU housewives changed their frame of mind. They needed to wash dayly SMALLER loads, often more times a day
The half load button/level was no more enough for these new habits. Lets' see why
1) If very small cotton/permapress loads are washed in too much water the frontloader doesn't lift and tumble them. They rotate while floating as in a gentle cycle, so there isn't enough mechanical action.
2) Another problem was the lack of speed control : half loads are lighter, so the drum rotated faster than with a full load.
Sometimes small loads weren't washed properly cause they went stuck on the drum as the machine kept on washing on a somewhat distribution speed (typical mid 80's Candy bug)
So washers were redesigned to be self adaptive. Smaller loads has more place to move. With proper level and wash speed they lift and drop more effectively, so the wash bath time can be cut down. Oterwise on full loads the motor senses a bigger load to move so the board increases washing times, number of rinses, spin profiles ....
IMHO Zanussi's Jetsystem (mid eighties) is a milestone in this scenario. Not a case Electrolux inherited it and keeps on using it after 25 years.
Others use rainwash systems / watermill-wheels system where baffles lift and spray water on the load to achieve a faster saturation
Here is a pic of Larry (CleanTeamofNYC)'s E'lux frontloader.
From a european P.O.W. it seems underloaded (or it could be a proper permapress load). But this machine has a wash bath lasting from 9 up to 21 minutes only, so these whites can get really white within 20 mins only if they have all this place to tumble freely.
As Ronhic said, just wonder why E'lux doesn't put Time Manager sys even on american washers
RINSING: despite they use less water (well built) modern frontoaders rinse better than old ones. My miele W844 (52 litres per a 5kg cotton load) rinses better than the W780 (115 litres per 5 kg cotton load). The older machine really spins before the last rinse, the newer one spins @ 1000 rpm at the end of the wash bath and of each rinse.
The older permapress rinses poorly cause has final spin only, the W844 has a nice permapress rinse cause of interim spins
Last words : yesterday I boilwashed a single bed set, 4 terry towels and a couple of kitchen towels in my 10 y.o. miele
It took only 75 mins from tap cold water to final spin, where it usually take 2 hr for a full load. Then ran shirts & trousers on permapress short 30°C (40 mins). Frontloaders don't always take hours to wash ...
