TBH the fan reception has been overwhelmingly negative to this. Every big thread you see about it on Reddit has nearly everyone saying it's bad in the comments. It's strange Larian talks all the time about how they changed Shadowheart's character due to fan feedback in early access but then they put something that they must have known would cause A LOT of backlash in the end of the game. I'm sure if you put it to a poll, players would pick a meaner Shadowheart that acts like her monogamous Act 2 self instead of a nicey nice Shadowheart who secretly (and randomly) wants to bang Halsin on the side

https://www.reddit.com/r/BaldursGat..._shadowheart_fans_opinions_on_the_act_3/

Just look at the state of that thread