I will admit that BG3's Dark Urge does sound to me like a way to play a character like BG2's CHARNAME in the new game more than anything else. That's not a bad thing in my opinion as it helps tie the games together thematically. One thing I am hoping though, which Larian has not mentioned, is that like in BG2 there might be benefits you can gain by playing a good-aligned Dark Urge character, rather than just for being evil and killing everything you come across.