But, it does punish you for hubris. For thinking playing with these powers will not lead you down this path. That's how it should be if Larian is serious about consequences. Of course, there should be outs. They're giving us a million warnings. Nonetheless, there needs to be this consequence at some point for your struggle to have any meaning.
On the topic of punishing hubris there is another far less likely resolution to the tadpole dilemma although I don't really think Larian implemented this in the final game. Because the tadpole in our head is in stasis and unable to complete ceremorophosis it does mean that it gets to be exposed to the host for a lot longer than it normally would be and if we feed it other tadpoles to give us power it creates a sort up unprecedented bond between the host and the tadpole unlike anything that would have ever been possible before. Now it's not unheard of for mind flayers to retain an aspect of the host's behavior like a nervous tick or something along those lines but this is something else...this might actually create the Adversary. I don't know if Larian have thought of this possibility and I certainly don't think they implemented it. But how good would it be if the illithids in their own hubris by agreeing to the alliance with the dead three and the plot to put tadpoles in stasis in the minds of people, thinking they could control it, instead end up creating their worst worst nightmare?