You misunderstood my argument on several points.
I didn't say that most women failed to reproduce. I said most women died before 30. I overstated a bit, but the point remains the same. Wikipedia puts the historical count at 1 in 100 births, which works out to about 10%, assuming the average woman had 10 pregnancies. In many cases it was likely as high as 30% of women dying in childbirth.
On the case of oppression, I said nothing about oppression. This is a division of labor issue. On the male side, as I said, there are a lot of high-risk jobs. But if you educate a man, you don't want to risk him in such an occupation, and it's fairly easy to keep him safe, and he can still procreate.
On the womens' side, you've got around a 10-30% chance that the woman will die shortly after finishing her education if you want her to procreate and serve in some serious administrative capacity. So it makes sense to train men in these roles, and keep them out of harm's way. Prior to the 20th century, however, you could not so easily mitigate the survivability challenges of women.