I don't think you're wrong at all on the subject of scarcity - I 100% agree that there will be less scarcity than most people think.
Other than the more obvious examples where product is held at high prices to increase profits, I dread to think of how many great ideas were killed at inception because they would be unprofitable (either in absolute or relative terms).
I would *hope* that mobility aids (and others) would not be contingent on labour hours - but I'm currently unconvinced (the pandemic has shaken a lot of my previous more optimistic beliefs).
I also think that there is likely to be a point at which "people" say "oh, that isn't necessary".
Like, most people would agree that shelter, food, water are 100% necessary, and I hope that these wouldn't be contingent. I *hope* that most people would say the same about wheelchairs, eyeglasses, insulin (and many, many other examples!)
I suspect that we would reach a point though, where people start to say things like "welllll, I'm not sure that an expensive food processor is *entirely* necessary" - which I accept, but being robbed of the ability to chop food for myself would take away my independence, and I would be prepared to trade *something* for the food processor.