Yeah, the practical example that immediately occurred to me, because of our recent conversation about ramps, was the fact that in my society many mobility-impaired people have traditionally been denied education not because they're "unfit" for education but because we/society chose to favour stairs as an architectural feature (note: framed with a social model of disability, usual disclaimers for people who conceptualise via a more medical model).

David Blunkett held one of the four most powerful and challenging political jobs (Great Offices of State) in my country when he was Home Secretary. He is also blind. His blindness wasn't an obstacle to him doing his job. BUT many blind people in the same society are denied employment they could do simply because our society has chosen to favour visual methods of "official" communication.