I absolutely agree - it's not unique if you hear it on a daily basis. Which makes me wonder who are all these fans constantly telling Shadowheart "You're beautiful"?
You don't have to hear it on a "Daily basis" for it to not be unique.
Shadowheart alludes to having past suitors. Presumably as a pretty woman, she'd have quite a lot of interest. Likely with people calling her beautiful or some variation on it (Such as Wyll as I mentioned)
So let's say you're single and alone like Shadowheart. You're walking down the street and Margot Robbie jumps out of a limo and gives you the most unoriginal compliment "You're beautiful." Are you really going to just say "I know" ? Of course not. You'd cling to that moment of attention and try to build a connection - unless, of course, you already have a lineup of beautiful women to choose from.
1) I don't know who tf that is.
2) I'm a guy, so receiving complements is already abnormal.
3) I've already mentioned that friends can complement each other. Which is at best what you and Shadowheart can consider each other at the particular moment in time (Intentions of a relationship are after this comment, with the kiss and follow up discussion in the morning)
Only if you met online. In Shadowheart's case, we're supposed to know each other quite well by the time the tiefling refugees arrive at our camp.
Uh... No?
Both, in terms of first dates not being about getting to know each other ONLY online... If you ask someone out you're not going to know each other. Heck, even in this case the entire scene revolves around Shadowheart asking you about your past in Baldur's Gate and remarking on how she can't tell you more about herself because she doesn't know anything on account of her brainwashing. Quite literally the entire date is about getting to know each other more.
In terms of how well you know each other... At this point in time you're both strangers. You've simply done a few things to make her somewhat like you. But you'd hardly even be called friends. (Of course, you can get some further development and trust in her confiding in you about her past, which would make you somewhat closer. But you still no next to nothing about each other, hence the date explicitly about getting to know each other)
But a BG3 date isn't some college party hookup - it's about choosing your closest and most trusted companion. In this context "You're beautiful" isn't just a compliment - it's an intention.
Actually, it's none of what you said.
The Tiefling party is about having fun and then winding down with a companion. You can choose from multiple companions if they like you. But its not necessarily an intention.
"You're beautiful" is just a compliment. You can say it and then not go for a kiss and not pursue a relationship with Shadowheart.
It is also not an intended compliment either. You say it because you were called out for staring at Shadowheart.
Absolutely agree - there's no need for it to be reciprocated. She just goes her way and I go mine after that. Which ends up creating a lack of female companions to romance in BG3.
There's plenty of female companions to romance in BG3. Just because you dislike small things about the way the characters act doesn't mean they don't exist.
Honestly I'm boggled that you for some reason accept Female Astarion who's 100x worse than anything Lae'zel or Shadowheart does (Even if you face full on vile Shadowheart by being a Selunite Cleric and confronting her Shar worship, that's still not as bad as normal Astarion).
Even Female Gale is worse than the actual female characters, because Gale is still actively pining over Mystra while trying to romance you in Act 1...
But you give these characters a pass because... Reasons? While being completely upset by the female characters when you actively betray them, or take a jokey quip way too seriously?
I really prefer idealistic love over casual sex in fantasy worlds - after all they're called fantasy for a reason.
But there are people who are like that. Shadowheart likely has met quite a few. As there are people like Astarion and Lae'zel who's romances start out with a focus on casual sex before any emotions start to be a factor.
Even Wyll is very interested in Lae'zel's focus on casual sex. Karlach is also pro-casual sex (Though that's in part because she's lacked any physical contact for so long). Minthara is quite noted for her love of casual sex, with her Act 1 camp scene being noted as the most graphic (With her recruitment meaning she's the least close to your character given the complete lack of time spent with her before engaging in this casual sex)
Just because it's a fantasy world doesn't mean it should be filled entirely this one ideal...
Shadowheart is one of the few characters that is in fact interested in idealistic love. But she has to check whether YOU are also interested in the same before she is willing to commit, in part due to the fact that there are plenty of people who are just wanting casual sex (And in part due to her own stigmas regarding relationships and trust)