I think the main epistemic problem is that the explanatory power of the null hypothesis (men and women are natively psychologically almost identical, but people know that women get pregnant and men don't and social structures take this into account) is pretty high and, even worse, often gives reasoning that's isomorphic to ev psychic explanations.
There's still a noticeable amount that it doesn't explain. To pick just one easy example: men and women employ different strategies for navigation. There's no particular reason in modern society for that to be true. If those traits were entirely learned, one would not expect men to have, purely by coincidence, learned only the skills that corresponded in the ancestral environment to increased navigation skills while hunting and at war, and women to have, purely by coincidence, learned only the skills that corresponded to navigation skills necessary for gathering.
More generally, a psychological trait which
is much better explained as inherited than by cultural conditioning.
Today's post, Rational vs. Scientific Ev-Psych was originally published on 04 January 2008. A summary (taken from the LW wiki):
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