Fascinating stuff! I'll hate to read it.

In my little story I introduced patriarchy a little later - some other researchers tie it to settled farming and bigger families , others to religion creating male ownership of things and people (which is the route I took, with a nod to the other). The Dawn Of Everything (if I'm remembering it rightly) seems to suggested a multi-pronged approach, where some different civilisations ended up with similar results from different starts.