If the disability is individual, that is, specific to the individual, the disability is still social. It is essential that the person with any kind of disability be disabled as little as possible.
You mentioned earlier that people with physical disabilities are able to think and make decisions. An old philosopher, Paul Ricoeur, wrote a book in which he said that autonomy is not reduced to physical and social autonomy, for example the role one plays in society and the economic power one has. Autonomy in the full sense of the word is moral autonomy, that is, having the capacity to make practical judgments about oneself and to make free and informed decisions.
I imagine that you agree with Mr. Ricoeur's comments.