As someone who wanted to play a white dragonborn when the game comes out, I can say that the scene with Karlach made me think twice.
I don't think the option should be taken out of the game. I don't understand that.
But that aside, just talking about me, I started thinking how it didn't look like a dragonborn could kiss. Not really. And that's no slight on the dragonborn design! Quite the opposite. The design looked so good that I felt off when I saw the kiss. It made me realize, on a roleplaying level, that I don't think I'd feel the same way about kissing and romance. And if that's going to be an important part of my story through the game, then maybe I'd better play something else first.