Another way to think of this is that everybody occasionally needs to do something unusual. But some people, due to their life circumstances, always need to do something unusual. And making things better for the always-odd folk is also a positive to the occasionally-odd folk.
Which like, we're all eventually gonna be odd folk! That's what age does to us. But we should understand these accommodations as being a net positive, not a cost, to society.
Yep. In accessibility research, they call these "situational disabilities". When you need to open a door with your arms full of groceries, you aren't so different from someone who is never able to open a door. Accommodations that help people with permanent disabilities also help other people in the right situations, too.