I'm autistic (AS), though I personally don't class myself as disabled.
Though, this is a interesting question.
With me, my diapers are more of a personal thing, I technically don't need them, but because I suffer slight bladder leakage and have to go pee every 5 minutes, I do for mostly comfort reasons and disliking to use public rest rooms, ewwies, the worst part about me is being sketchy and always needing to know where the toilets are, I wear them mostly to avoid conversations about toilets because personally I don't know how to talk to people, and get anxious doing so, so in a way, it does fuel my desire to use them.
I know this is a bit of a different take to this question.