People are different but the demands of 99% of actual jobs are far below that those natural differences won't matter as opposed to standardized training.

And it's a good thing that it's like that, because we don't want our society to be reliant on a few Rockstars. As Napoleon stated, an individual Mamluk far exceeded an individual Frenchman, but 1000 Frenchman could always defeat 1000 Mamluks.