I mean , I'm coming from BioWare games and believe me, when I say, those fans are a thirsty crowd too. But it either got worse in general with the romance and sex thirst in games or the BG3 crowd seems to be extremely thirsty. Which I don't have a problem with, as long,as it doesn't take over the story. To stay with the House of Hope example: if there were more about the Hearthflame sisters, I wouldn't care about Haarlep lounging in the bodoir. But leaving the first story with so many questions and then opening up the second one and leave it unfinished too. I mean, it does seem, that there is some untold story between Haarlep and Raphael too, especially if you use Speak with Dead on Haarlep and get to know, that he was a gift from Mephistopheles, who is involved in more than one story throughout the game, namely Gortash, Durge and the crown and Astarion/Cazador with that ritual, plus being Raphaels father and I really would like to know more about the involvement in the whole story with Mephisto. But yeah, most people just don't look past the incubus sex and the insult for Raphael. I think, it is a bit of a wasted opportunity, especially since the hells okay such a major role.
I feel like sex and bad jokes is what Larian wanted to add whenever they could. The joke about Raphael is that of a 14yo, the dialogues with the Drow twins are so cringe and shallow, they tried to make jokes at the expense of some companions (like Gale) or wanted to add some problematic topics as kinky and jokey stuff.
Then you have Mizora and all the companion's reactions. No way anyone would be like "Please tell me all the details" if you just had sex with someone who tormented someone from your group - but, as Surge90sf said, the ground doesn't even deserve to be called like that. It's just a bunch of (mostly lovely) people who are there to give you (mostly) good stories and to share some thirsty conversations with.
But, as you said, that's enough for the crowd to be happy with. They even appreciate everything in the game and tell Larian to ignore whatever critical feedback we might come up with (if you want to see for yourself, check the Discord feedback channel for appreciation and this is only one of the white knights who defend the game at all cost and hate feedback. Let's just ignore the fact that feedback may allow a company to grow and make it better next time).
Let's be honest: BG3 has a great soundtrack and nice graphics and some good companion story lines and that's about it, where is sticks out.
EDIT:
Even if Larian would fix some main story parts, the thirsty mass wouldn't even give a s$%& about it. Larian went all in to attract people only looking for a romance simulator. There are people already asking for more Astarion content when he already had 50.29% more content time on release than Wyll, not to mention Minthara or Halsin.