I mostly agree with this. The romance in this game has become one of the highlights of my playthroughs, simply because it sheds a lot of light on the characters we interact with, and this is one of the main appeal of the game for me. When you romance someone, you get to know more about their inner struggles and how love can shape them into a different (and sometimes better) person. I’m always going to be more invested in the character I’m currently romancing (duh). In that regard at least, I think Larian did a decent enough job.
The issue is that it definitely feels shallow at times because I think Larian focused more on the sex lol, it sells. There is also the lack of reactivity to the main story, as others have pointed out above. It makes the romance feel super disconnected with everything else. One example of this (which I'm very disappointed with) is when you play as The Dark Urge
and die at the hands of Bhaal, but your lover doesn’t have the appropriate reaction.
That and numerous other instances makes me feel like my choice in romance has no impact whatsoever, so I get why people don’t bother. Also, I just want to say, the reason why most people choose to ask for a hug option instead of a complete romance overhaul is because we know it might be asking for too much. Some of us are trying to be realistic here. and hugs are nice XD