Asking out of ignorance, on average, compared to people without disabilities, do disabled people produce more or less than their non disabled peers, academically speaking?

If they are then, an objective system would pick a disabled person, else it should pick a non disabled person, other things being equal or better.

As a matter of law and ethics the answer could be different in either case, but objectively, is the system outputting the better answer?

Of course laws and ethics may direct us otherwise.

Hawking was disabled, but you’d be hard pressed to find a better astrophysicist, for example.