I'm not an AA fan because I feel it makes him into a buffoon, but I disagree with the sentiment that "Ascended Astarion's original kisses were good because it shows the player how big of a mistake they made (if they ignored the several massive red flags along the way)." The people playing BG3 are presumably adults, this isn't a YA novel, and I think people should be able to roleplay their characters and choose how they feel about something in a roleplaying game.
So, I think the neutral expressions are the right way to go because players can use their imagination about how their character feels about the kisses. Also, Astarion has gotten soooo much content compared to companions like Wyll, just let him be at this point and focus on other characters.
