The male as "protector" is one that from a racial imperative viewpoint is logical. Once he has passed along his genes to a new generation (in one or more offspring) his existence is relatively unimportant. It is certainly best if he can stick around until the offspring are self-sufficient, but not necessary.¹
An excellent post.
I've said it many times -- biology is real.
There are many solid, biological difference behind male and female social roles -- all of them rooted in the inescapable fact that women are vulnerable while reproducing.
But I am quite convinced that cavemen probably preferred a strong, capable woman who could put a javelin into a wolf that came sneaking around the cave while he was out hunting down the mammoth over one who cowered in the back of the cave while the wolf ate his kids.