The advantage is that the person under different class, gender and other categories of identity have different legacy from their ancestor. They learn skills according on the basis of their background. And maybe someone else from different background cannot learn skills as much perfectly as the person from background.
For example:
It is easy for a farmer's children to learn farming more detailed rather than the children of barber.
But in modern world, anybody can learn whichever skills they want through the internet. But to some extinct it offers a distinct advantage.
