Yes, accessibility is all that too. But those things are what the vendors usually do not want to do. As in, actively, because that gives agency to the user, and would defeat whatever abusive business trickery they built the software to inflict on people in the first place.

We talk about accessibility in terms of extremes, because those extremes are where we have legal support that companies can't ignore. The vendors don't want to cut the curb, they want to replace it with a fence and a toll gate. Talking about wheelchairs and strollers lets us prevent the fences, and the toll gates. If they figure they'll skip the curb too, every user wins, but this won't happen without prioritizing wheelchairs, and won't happen if we emphasize regular people too much.

Or, in short, accessibility is the only weapon we have to fight dark patterns and maybe get some ergonomics for everyone.