I suspect the conventional wisdom of the current era downplaying biological and behavioral differences between men and women may have a little to do with a big shift in recent centuries in which animals humans most come in contact with, from farm animals to pets.
Not all, but many farm animals, such as cocks and hens, rams and ewes, and bulls and cows, feature extravagant sex differences. For animals we eat, having a lot of surplus males ready to battle it out with each other to be the reproductive king of the hill isn’t a problem: we just eat the poor losers.
In contrast, pets usually don’t have huge sex differences: I owned five parakeets in a row as a child and really have no clue whether they were boys or girls. The sex differences among dogs are not huge: People who are into dogs have opinions on what those differences are, but there are relatively few stereotypes among the general public. Tomcats fight more when prowling at night, but around the house their behavior isn’t all that different from the female of the species.
And the common practice of neutering pets reduces sex differences even more.
So, our worldviews about human nature may be subtly influenced by the non-human nature we are most exposed to.