We already have a debuff on the game that makes you unable to crit (consecuences of your dialogue options), what makes you think that you won't get penalized (heavily) from abusing the tadpole? (probably measured on different thresholds, like you said, not going to lock you into an evil ending for having 1 tadpole trait)
We're obviously speculating but we cannot know either way (there's probably a sweet spot where you can minmax the tadpole power and not get too penalized, that much I can assume)
