If characters in a story have a disability the question should be "What is the DM/Author trying to say, and how does this character add to the world they are portraying?" The plague of diegetic essentialism etc.

Had a session last night, where my player where asking this question, and posted this post as a response on the screen, and it started in, how could we do a magic chair into, let's make an exo-squeleton. I come there to say,

That as a DM I have stollen your stuff and added it to my campaign

Make magic that cures disabilities, then there’s no more disabled people. The only reason then would be if you want to be disabled.