From an organisation’s point of view, does it matter how one person came to be a better performer than another? Surely they just care about current state: this person performs better than this other person now.

Perhaps had their backgrounds been different, their performance would be different. Perhaps if the under-performer had more training, their performance would be better.

But right now, things aren’t different. From the organisation’s self-interested point of view, they should just choose the better performing candidate.