Interesting points. And I agree that the reduction in other systems of family are a result of military and economic power. But the article is proposing a theory for how the Western military and economic powers were able to outcompete the others - for how such an imbalance in military and economic power was able to develop. I agree that you can't point to everything and say "this is why," but I don't believe he has done that. He provided extensive arguments.

Masuo women may have sex with less partners, but has it been confirmed that they have less sex?