Both playing good and playing bad should have repercussions and rewards. One door opens, another closes, etc. Larian is really uneven in that department it seems though.
This tadpole thing though? No repercussions choosing to do it or not? I don't think that it's a matter of good versus evil here. If I were to hazard a guess, I'd say that Larian decided that the parasite 'progression' system from EA where you had to use the mind control, seek out new powers through npcs etc was to much work narratively, so gamifying brain parasites was a visceral way of giving out upgrades that they could control the pace of acquisition easily by the number of enemies with the parasites. The fact that no sane person would ever put a *second* mindflayer parasite in their brain because it's completely insane is something that's expected to be handwaved away as gameplay and story seperation....even though the entire plot of the game revolves around how bad having one of those worms in your head is.
It's just questionable writing, period. Not really something on the good-evil scale IMO.
