At that point we wouldn't be role-playing though, they'd design an entire feature JUST around trying to trick the players. Everything we know is screaming that "tadpole = bad", and the powers are awesome, but taking away our humanity. If you play the game like that, role-playing and then in the final act "lul, j/k, the tadpole is good, you're fucked", it would make all our decisions seem completely fake, and take all control away from the player imo.
I agree, they will make it obvious well before the end that the Dreamer powers are benevolent.