Every forum caters to different folks. The subreddit is different from here, for example, and while it is certainly more popular (obviously), it still hosts only a small portion of people that have played the game. And I think people that frequent there don't care much about a good story as much as they do about shock value moments - things to talk about - regardless of how little sense they make. And more power to them, they're free to express their opinions. I do think, however, that the majority of people playing a D&D CRPG care about a well flowing consistent story.

As it stands, Halsin's romance story, and those involved in it during it, are not written well. They don't flow with his overall writing leading up to that point and give far too little to develop him into what they wrote him as for act 3. The amount of suspension of disbelief required to have it work out is a big ask and it'll cause plenty of people to lose immersion and personally I think the silent majority (of those that dabbled in Halsin's romance) did not like the direction it went in because of this. That's not to say that people don't like the idea of a poly or an open relationship. That's to say that people don't like it when it doesn't fit the given narrative. If anything goes in the story and it doesn't flow anymore, the writer will lose the reader's attention.

So it's purely an assumption but I think that there are a lot more players than it may seem that are disappointed by these inconsistencies, because people in general just don't like inconsistent writing if they're invested in the story.