I've never really had a major issue with less typical romantic relationship dynamics, so long as things are safe, sane, and consensual (yes, I borrowed that one), and so long as those involved aren't especially pushy or preachy about it to everyone they come across.

It might work perfectly well for some people, for others it's a recipe for catastrophic disaster.

I somehow doubt it'll go well for a couple that's actively engaged in gender role roulette and musical pronouns.

For anything as tricky as polyamory or an open relationship, having that kind of a spastic personality, lack of self, and vague direction is just going to lead to inevitable conflict. And that's not to mention how unhinged these individuals already tend to be.

Edit: Some details were bugging me so I had to give it a re-read. Seems I skimmed over how this was maybe a 4-6 year gradual progression. The person at least seems to have developed some actual insights beyond simply having some wild fantasies... but then devolves into woke-speak drivel.

And that final line is just a little nope-tastic for me: "I can't wait to see our kid learn what home and family means to them. "

What could easily be taken as just curious pondering honestly just reads like a quietly discreet glee at seeing the possibility of her kid being influenced to follow a similarly less traditional approach to relationships and family. Taking pride in seeing your kid grow up and become an awesome person should be every parents' goal. Taking pride in the idea of them emulating your fetishes on the other hand, is quite frankly, just fucked up.