I sort of agree with you though, I'm not sure we disagree. See my second paragraph, though, "B" in this case actually isn't a great measure of how well you'd do

I sort of agree with you though, I'm not sure we disagree. See my second paragraph, though, "B" in this case actually isn't a great measure of how well you'd do STEM but is more of a determinant of whether you'd try STEM out in the first place over the "A" fields. And yes, after that, market like forces might keep them or pull women to "A" fields eventually.