I can't say I agree with either of you about Sarevok or Viconia.
What about Keldorn's personal quest, that was the kind of story that plays into alignment that wouldn't be out of place in any number of current rpgs.
It's come up before, but Dragon Age 2 had companions whose personal stories were about whether or not they would be overcome by their own tragic flaw, and I loved that aspect of the game. If BG3 has a similar dynamic going on for each of the origin characters I would consider that 'bad' or passe.
