Not a fan. If we romance someone else or nobody, those two end up together. That's like most playthroughs in a branching game not counting romancing one of those character. It makes us feel like the meddling one in between their romance. I hate RO characters who are exes. It immediately crosses out the option of me romancing them in the event that they might get together or offer a poly route. We feel like the third wheel.I don't know about you, but how do you guys feel about ROs being into each other? I know its mostly to sell the idea of a poly but I generally don't like it because I don't want to play polys and to know my RO is into someone else, it sours me.
Call me jealous or whatever, I don't care.
Also who in the right mind would date the ex of your colleague or friend? It's too weird. Imagine being around your friend who happens to intimately know your partner at the same level or even more than your character.
Some might say that it's just a game but these kinds of topics are real for a lot of people. It's not like murder or tragic backstory which most of us are not acquainted to, hopefully. These topics are safe to traverse cuz we have a certain fantasy about it compared to being cheated on or being in questionable relationships which is very real to almost everyone. It gives us the ick. In short words, being in a relationship is way closer to reality than committing murder or getting tortured. In a way, these are also kinks but are way more relevant in terms to story telling. The latter is more easier to roleplay than the former.