It's not that it offers no advantage, is that it offers no immediate disadvantage.
A discriminating culture that happens to have more material advantage at the start could just wipe other more egalitarian cultures without much concerns. It's only very recently that physical strength has lost its importance as a driving force in cultures clashes.
It is possible that in a future where intellect matters much more, but life is still cheap, a more egalitarian society will employ women more efficiently and thus prevail against discriminating ones. But it seems that the more material wealth we have, the more relaxed we are about the whole killing other people stuff.
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