I holiday with a disabled adult quite often.
They have some mobility issues, but would be unable to use a stairlift independently - whereas they can usually walk up and down standard stairs. (We usually check photos, as open tread stairs those without handrails or spiral staircase and things are harder.
However the stairlift being there might well make it harder for them to use the stairs because it would likely be narrower, might be harder to squeeze past at the top or bottom, or might just be distracting and make them anxious. So they would probably be less independent, ironically.
So we would probably avoid, unless there was a lot of info, pictures, dimensions etc, and we were sure it would be ok. Just not worth the risk.
In the same way we avoid wet rooms. Great for some people with disabilities, but personally I hate getting soaked myself while helping, so a proper enclosed shower, or even better, a bath, is a must for us.
There isn’t a one size fits all solution for disability and access problems.
Some people need certain things, those same things put some others off, or make it harder for them, that’s just how it goes.