> Genuine curiosity: if you are gifted with a certain “wiring” (genes, brain chemistry etc) why is that considered an accomplishment?

It's complex; first of all society has an interest for exceptional people to be respected and well compensated; if there was absolutely no prestige or compensation in being a math genius it's quite possible Terrence Tao would have become a schoolteacher. So a well functioning capitalist society has both monetary and prestige tools to incentivize extreme accomplishment.

Second, I think it's human nature to like and want hierarchy. Admiring figures for their looks, charisma or intellectual accomplishments could very will be in our wiring - 20 thousand years ago we would admire the shaman, the great hunter or the storyteller.

But ultimately I totally agree with you - not only were these people born into the unique genetic and envrionmental circumstances that made the accomplishment possible , I also don't believe they had any say after being born in becoming what they had become; e.g I don't believe there's a "free will" and that Terrence Tao "chose" to become a math genius. He was born into that reality in a fluke.