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.
While we don't exactly know where enbracing tadpoles power would lead us, tadpoles biting into our brain as we use it doesn't seem great. Reminds me very much of Slayer form from BG2.
The tadpole writhes. Your mind suddenly feels as if bitten.
https://youtu.be/XSc17QXxfyU?t=5007