I think you're trying to counter my off-the-cuff (re)-definition of accessibility. You're pushing it into the sphere of "it's just for disabled people".
I agree that's how the word is used most often. But using it that way others disabled people. Othering allows decision-makers to ignore the out-group because "it's not economically viable to support them" or because "it's too difficult" or "we'll have to learn & refactor, which takes time away from features"... or whatever.
I consciously put forward the suggestion, somewhat masked by my flippant tone, that developers (in the sense of anyone involved in "making": CEOs, management, designers, engineers) could do a small shift in their thinking that would open up the idea of access for all. This would push back the othering of disabled people, would include them. It would allow developers to work more creatively with the idea that their fellow humans interact with with products and services in myriad ways.
Even if you want to take the tighter definition of accessibility put forward on Wikipedia, the topic can still be opened up to new perspectives. Consider the differences between the medical and social models of disability. The medical model says that disabled people have deviations from mean physiology or psychology that must be addressed symptomatically, under "medical" supervision. The social model[0] pushes the disability out to our social systems. Sure, some people have "incapacities" - challenges with movement or sensory processing etc - but the dis-able-ing is enacted by the social systems (design patterns, funding, font-sizing, stairs vs ramps, stigma, othering) that ignores the needs of anyone off the mean.
I struggle to see clearly at distance. The fact I don't know which train to board is more because the station designers built the timetabling system with a typeface that can only be read comfortably by those with mean/median vision. If they printed it larger, I could stand in the crowd and read the sign like everyone else. If they'd installed a PA system and announcements, I could use my hearing instead. (fortunately, most stations do work this way now. Hopefully you can see the systems thinking in my example).
[0] https://en.wikipedia.org/wiki/Social_model_of_disability