Poly has it's pros and cons. I dated a married poly woman for 6 + years. She had one other boyfriend a year longer. Only her and her husband lived together. Most of the time, us boyfriends lived just 4 miles away in a city.
Very few "living together" poly arrangements can last. I know of 2 lliving as a "V" right now, and I know a ton of poly people. It's not the sex that can break them up, it's basic roommate problems, or possible time sharing troubles.
I now idealize the couples that just have FWBs on the side, with who that have a little bit of feelings too, but I still give one type of polyamory a good nod, the hierarchical type that keeps the marriage as #1. I guess it takes a certain kind of person to be a secondary partner. Usually, it's people that have a spouse already of their own.
To me, lots of FWB situations are kind of poly-lite, but they just never put the poly label on it. There's feelings and all that jazz, but...... yeah..... they don't take on the poly label. I guess some people think it's because they aren't living together. I think it's more because they're just otherwise traditional people who don't need or want that label. So, the cuck knows the wife and bull have feelings for each other, and everyone just keeps on staying in their lane (usually).