I found the writer massively self-indulgent.
He's at Burning Man when his wife miscarries. And stays there. Feeling his particular pain alone, and leaving his wife to do the same.
He waits until after a major financial investment to inform his wife of what was clearly an actual deal breaker in their relationship.
He justifies every act of infidelity with the attractiveness of the person he cheated with. If me and my partner agree that there will be no extracurricular kissing, those kisses don't magically not count just because they involved really sensitive, artistic, special people.
The way the writer presents polyamory as a way to address meaning in a childless marriage makes no sense, and was potentially hurtful to his wife.
The writer's wife seems very passive and absent in all this, but I notice that when she brought her baby to meet her ex, she kept her current partner nearby, but out of sight. Like a safety precaution. I wonder how she really feels about this dude, and about this article. I saw the head note that says she consented, but she clearly consented to some things that made her pretty uncomfortable, so I wonder why she consented, and if she feels safe withholding consent, or in general.