which most men lack is simply being masculine and in charge enough to handle the women. Most guys can't handle one much less two. They are as yet untested by that fire.
Now there are a number who think they can and may have a 'great marriage'. But too often that just means low conflict and is because they are pushovers who go along with what wifey wants all the time or are very nice or bland enough in tastes to have never rock the boat. This type will rarely contradict the wife, wouldn't dare do anything that makes her jealous, or would avoid making her do something that displeases her. For such if you throw a second wife in the mix, or even just voice that desire, look out. So they've never had a power struggle to sort out their hierarchy. She's likely never had to temper her jealousness, possessiveness, or control.
edit: I'm not saying the second set necessarily lack balls. Sometimes yes, but some people's personalities are more easy going and not very demanding of their wife and so the relationship has not gone through the same trials. It depends on the person.
I'm not saying you are saying so, but masculinebehavior in marriage (monogamous or otherwise) isnt necessarily defined by how much overt dominance a man has. Submission can be achieved by showing care and servanthood.
A famous saying in leadership/education is: "people won't care how much you know, until they know how much you care." In our modern societies, where women have been trained in dominance, it can be tweaked to say "the woman won't care how manly you are until they know how much you care." In my experience, people are easier to lead when you show them that the path you want to lead them on is honestly in their best interest, not just yours. It builds trust. And when you've earned trust, through honesty, submission is so much easier.
How that applies to plurality, I'm not sure. I'm not a practitioner. I think it would play a huge role in making things work, as opposed to contributing to failure.
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