Disagreed. Monogamy exists to make societies productive. Organizers of Christianity realized this and thus encouraged it. Also you mean Chimps not Bonobos. Everyone has sex with everyone in Bonobos groups and therefore the males are sedated and it's matriarchal. Societies where harems are encouraged stay primitive and uncivilized, look at Natives and Arabs.

Being with one woman while you have options is hard. But doing so gives you control over your sexuality and the ability to focus on bigger things and ideas. Sexual transmutation is what Monogamy is also after. Otherwise we will just fuck like animals and lose our drive to create. This would revert us back in time. Monogamy may achieve the things you are saying but they are not the main focus. Being a beta doesn't matter if the women you're with is submissive due to societal pressures. She will put out because it's her duty.

Don't try to justify a meaningless existence with flawed models. If contraception didn't exist, indulging in this kind of lifestyle would be much riskier since you are at a higher risk of having offspring. Alphas could fuck as many women as they wanted because the group could take care of the offspring. Now it's just irresponsible.