Other than the game literally screaming that it wants you to romance her, I have no issues with Shadowheart.
I felt quite the opposite, you have to try harder with her to get on her good side.
Gale was the one who I felt the game was nudging me in the direction of constantly and I wasn't interested in him even.
There's a difference between "the game" and "each character" screaming at you to romance them.
Astarion, Lae''zel, and Gale all explicitly scream at you to romance them.
The game (presenting SH as a mystery, making her one of the first companions you come across on the beach, the fact that she has a tender fireside-chat scene instead of a fuck scene) is steering you towards her much more so than to Wyll or Lae'zel.
Wyll...idk he's busy screaming at his love interest.