HOWEVER... tackling the issue that's being discussed here: it's true that Tav's expressions during the kiss are removing the option for players to imagine how their Tav would react, which is also one of the charms of RPGs. It's early into that relationship, maybe they're into it, maybe they're just a bit nuts (lots of Durges playing that route) , but most importantly: this is a Tav that has gone through the kneeling scene and accepted it (which has similar elements) and is then asking for a kiss, perhaps several. A Tav in that situation could be scared, sure, perhaps it takes them by surprise, but I think usually they'd know what's going to happen.
I think what BG3 should do (well, in my opinion, it has done it since full release, but not everyone sees it that way) is to give you the tools to explore and reflect on that story and how that relationship would develop, not automatically assign the player character those emotions under circumstances that don't make a lot of sense. I don't think the sentiment is wrong, per se: Tav or at least the vast majority of Tavs would eventually realise that this wasn't a good bargain that they got themselves into, but this was handled clumsily. Also, I already said this in another thread, but sending out the message that this kind of relationship is harmful, while valid, doesn't mesh well with the fact that the kisses are set up as clear fanservice that's meant to be sexy. They should pick one or the other.
If you look at other RPG video games (those nominated alongside BG3 for different awards or just the most famous examples), the games force a ton of emotions on the protagonist. BG3 is also a self-contained story written by Larian, it's not a tabletop RPG with real-time reactions from a GM or a dating sim, which prioritizes the player's emotional state.
You can imagine that your character would enjoy that, but BG3 was written and animated by Larian. If they imagine the Astarion - Tav (or Tav - any other companion) romance a certain way and it does not align with your personal preferences, though luck. It's not a failing on Larian's part. It's not even outside of what other RPG video games do.
