Hi there,
Personnally, despite the colleague landed, I do not agree to let a pilot with a prothesis arm, flying professionnaly... but I do not make rules and take decision, it's just my view.
We can congratulate him, but in the same time, be AWARE, that it is OUR JOB and simply our job to land a plane in safety conditions. So, we can not say that this captain was a hero or what. He did what he HAD TO do. No more, no less.
What if , if he would have crashed ? what families would say ? huh ? What we would say ?
About the airline policy, an equal opportunity does not mean to put everybody in a cockpit. In aviation you can be Sim instructor no ? You can work in management field ? no ? so, that would have been equal opportunity too.