The second gameplay hinted that the tadpole also gives you several abilities (like the force persuade that Lae´zel used several times) and that the use of those powers could have consequences ....
Except that I don't see anything yet that signifies *meaningful* consequences. I don't see any meaningful reason for any player to not use the tadpole. And that is terrible game design.
After only two gameplays and with the game not even in EA I do not think we have enough information to judge that.
Sounds like you have the review of the game already made. Gotta love the doomsayers of the crystal balls and tarot cards.