I think in the end for me, it's more about like...why would a character be evil though? Like i don't mean evil in other situations, just in the overall arch of the Absolute. Like as far as you know, your character is being hunted. When you tell the 2 brother and sister that you're the "survivors" of the ship or w/e, they want to kill you. You attend the Mindflayer ceremony at Goblin Camp and they want to attack if you can't persuade that you're a true soul, bc you killed the mindflayer. Right now the character has zero motivation to be joining the absolute or do anything. Again, it's Smart Evil vs Stupid Evil for this specific scenario. Losing all the "headcanon" stuff that oh this could happen and i can play both sides, etc etc. It...doesn't happen.
Hell I had no idea youcould even side with Minthara until I read about it, so even as a player it's not an option you learn about its just....it can happen. But half the time people might have already failed checks, failed sneaks, etc to get to Minthara and already started butchering half the Goblin Camp. Game Design wise it's weak to make you side with Minthara and the Goblins, and storywise it's just as weaker because your character isn't promised anything, again ignoring any headcanon stuff people might have like oh this can happen and etc etc.. You talk to Minthara and she's like "oh a true soul, lets go butcher a few druids and refugees"...and it's just like...okay? Cool I guess.