I'm pretty much in the same camp as most people here. I don't enjoy shipping the ros together in otome either. I play otome because I want the romance to focus on the heroine and the ros, not on the ros with each other. If a route leaves me feeling like the ro is more emotionally invested in someone else than in the protagonist, it just kills the romance for me.
The only thing I disagree with is the harassment aspect. If someone wants to make BL fanart or headcanons in their own space, I don't see the point in attacking them. Just block the tags, mute the accounts, and move on. Likewise, people who enjoy those ships shouldn't try to push them into otome-focused spaces or demand official content - respect goes both ways.
Which game was this? I follow the indie scene, but I don't remember playing this. This actually reminds me of another game I came across once, not exactly an otome/ amare, it was an interactive fiction novel but it was marketed as a romance and it had two male ros. One was hung up on his ex even on his supposed solo route, while another "solo" route wasn't really solo at all - you either join an existing poly relationship or continue dating him while he also remains romantically involved with another character. That game really was THE chair sim - never dropped a demo that fast.