I see your point.
Biologically we have 2x more female ancestors, meaning that women have less issues producing an offspring.
Most men that ever lived had never produced a child. In that sense, polygamy serves Average Joes as an opportunity to pass the genetic materials (biologically, that’s what the fuss is all about- making little humans.)
However, biologically too, men can go around and have off springs with as many women as they please. We’re talking about top-of-the-food-chain guys here. In that sense, polygamy is limiting top-shelf _____ to go around and plant a baby in every woman in sight.
This argumeent feels like a two way street, don’t you think?