"Not only that... but the mere fact that it doesn't spin means things may not get rinsed well... You really need to spin between wash/rinse... I mean, I guess if you have a spinner you can do the dance of washing, taking out, spinning yourself, returning to washer to rinse, then spin again. I'm exhausted just thinking about it."
No, not exactly....
Have said this before and am doing so again, washers back in day were just that far as industrial/commercial H-axis machines were concerned. That is they washed and rinsed only. Sopping wet laundry was then moved to an extractor for water removal.
Braun came out with first high volume washer/extractor in 1946 and it was off to races. By 1954 EDRO and others also followed introducing their own washer/extractors.
https://www.edrocorp.com/history.html
Even after washer/extractors became the norm for industrial laundries there was (and still is) considerable debate regarding extraction after wash or even rinses.
Some laundrymen feel extracting after main wash and or before a few rinses pulls dirty water through wash. Thus textiles being laundered will act as a filter for said dirty water.
Indeed even well into 1980's and bit beyond h-axis washers sold in Europe or elsewhere for domestic use did not spin after main wash, nor until after two or three rinses (Normal/Cottons/Linens cycle). My Miele W1070 does not spin until after third rinse and even then it's only a short pulse.
Rinsing is a process of dilution. Differences between extracting after main wash and between rinses versus not largely come down to water usage. By not forcing out soapy/dirty water after wash or between rinses you need more rinsing to dilute said soils/muck/detergent etc...
Older front loaders from Miele, Asko, Bosch, and rest of European washers often had four, five or more changes of rinse baths with nary a full or perhaps just a pulse spin after first few, then a good extraction spin before final rinse.
By not extracting water between wash and subsequent cycles laundry will absorb less water at each next fill because it is already saturated. Modern domestic front loaders now often spin after main wash and subsequent rinse cycles (in some cases violently), but they use less water at rinse fills. More so if machine is using jet spray recirculation systems to saturate and help move water through load.
You can see from these videos washers that don't spin after main wash and or between rinses are perfectly capable of delivering acceptable results. Long as washer isn't overloaded and or too much chemicals are used in wash.
Laundry Alternative's "Niagara" washer teamed with a spin drier is just a new take on something old. Instead of a twin tub with teamed washer and extractor you've got two separate appliances. Washer that doesn't extract replaces doing job by hand then having to haul wet laundry to a spin drier.