I think this is a very astute question, thank you.
I don’t think anyone gets to judge that choice but the person in question. For ages, all us people with able privilege lived with the myth that EVERY person with a disability would happily trade for a chance to be ‘normal,’ but that clearly isn’t the case. And many people believe that who they are is just fine and they wouldn’t trade, and good for them for exploding that myth.
But I don’t think anyone gets to judge anyone either way.
As for disability being a sign of weakness…people who think that must not know any people with disabilities, I guess. Urgh.