The idea that gender roles were not important throughout recorded (and unrecorded) history is silly. https://theconversation.com/where-were-all-the-women-in-the-stone-age-73374
There are lots of reasons for gender specialization, but elitist women who do not specialize in their gender role don't understand how lesser mortals use that role to make their way in the world.
Egalitarianism evolved? Maybe. But so, too, did the physical differences in size, strength, and hormones. How does that happen absent a survival advantage to "sex dimorphism"? I suspect that paleo egalitarianism meant that beta males got laid, too. I guess that's a start.
You may not be aware of this fact, but it is possible to disagree without being disagreeable. Why do feminists have such sharp elle beaus?