Looking at the other thread regarding Halsin, the main issue seems to lie there. Once Halsin becomes a companion, they seem to have decided to lean very heavily into the daddy-bear joke and assume that those who bring Halsin along are the ones who are interested in exploring that whole poly-dad-bear story arc (since there's no role for him to fill otherwise with Jaheira as the more obvious canon character). Unless I am missing something there are no quests in act 3 where he plays any major part, so the writing assumes that you only brought him along for bear jokes and poly-romance and they make Shadowheart adapt to that. If Shadowheart didn't play along, would we have threads with people complaining that they wanted to have a Shadowheart threesome, but she is too much of a prude to go along with it and it ruins their fun?