As a man there is no benefit to becoming EMOTIONALLY exclusive with any woman ever. You can be exclusive on paper if you want. But emotionally, you should be free like a bird.
I was going to make a couple counterpoints, but you beat me to it.
Abundance is a state of mind--it shouldn't be rooted in anything external to yourself (like plates, money, a girlfriend, that awesome job, a good social life). I think a lot of guys (myself included, at one point) use spinning plates as a band aid solution to avoid pain, without ever internalizing abundance as being something that you generate within yourself. The truth is, your value is irreducible. Whether you're monogamous or spinning plates or have no plates to spin; whether you're making 6 figures a year or don't know where your next meal is coming from; you should never base your self-concept on external circumstances, because circumstances
always change.
We're always looking outside of ourselves--and while it's better to have your dopamine sources diversified (which is why spinning plates is never bad advice, nor is cultivating wealth and good friends, etc.), all of these are potential comfort traps; and the minute you attach yourself to comfort is the minute you are no longer emotionally free. This is still treating the symptoms instead of the disease itself--which is really the belief, that
I am not enough. There are valuable lessons a man can only learn about himself in a monogamous situation; just as there are valuable lessons a man can only learn about himself when he's spinning plates or is totally celibate.
For myself, I want freedom of choice. I want to experience to full emotional range of what life has to offer. I know that pain is often where growth occurs. So I find which areas of myself I experience the most resistance towards and I dive in and push myself in those directions. Right now, my heaviest resistance is toward pair-bonded relationships. So I'm (probably) going to give that another spin or two and take on the challenge of holding frame without the advantages and emotional escapes that plates offer.
But is that the endgame? There is no endgame lol. Only you. And that's freedom.