It is a strategy for maintaining the moral high ground.
Given how ubiquitous this behavior pattern is (pretty much 98% of
women everywhere, across the globe), I suspect it is a vital survival
mechanism for women.
If I had to guess, it'd be:
Men who feel confident / in control are the least likely to
remain committed to a woman (there's research on this... the most
desirable men are also the likeliest to divorce)
Women who are able to keep men in a state of confusion/doubt are
those most likely to retain men's continued resources and protection
Therefore, there is a huge survival advantage for women to never
yielding the moral high ground
The solution is to save the deep intellectual conversations for your
buddies (and the positions requiring large degrees of accountability
within your organization for male hires).