Huh, really? I thought there were slightly more women than men, but maybe that depends on the economies etc.
As for your second point, yes, exactly. They don’t reproduce. So it doesn’t matter if many men get one wife each, or if a few men get many wives each, the number of pregnancies won’t change, and the number of pregnancy-related deaths won’t change either. So (again), I don’t see how polygyny helps in this situation.
I guess I’ve forgotten what the problem was exactly. High maternal mortality? How is that not solved by having many redundant wives?
You don’t just “have many redundant wives”. It starts out roughly 50/50 from birth no matter what you do.
You either have more women by having a lot of single men, or a lot of dead men, or by taking women from other places.
Yes I mentioned that earlier in the thread. Polygyny = some men have many wives, others have none.
