I will say that I don't think a written warning is strictly necessary because EVRY PART of this feels like a warning. The image of the atrophied brain, the tadpole BURROWING into your brain, just the thought of putting a tadpole into your head, its visceral upsetting and you don't need to try hard to convince anyone it's a bad idea.
But Buria makes a good point about it from a story perspective. It feels like this isn't the sort of thing we should be able to do until later in the game, when we have a bit of a clearer understanding of the tadpole and we have a thread to follow specific for controlling rather than removing the parasite.
Lore wise it's a mess because more than one tadpole in one host would almost certainly guarantee the ceremorphosis fails and there is no lore precedent for people wanting more tadpoles in their brain or gaining more power from more tadpoles not to mention these things kill the host and so on. I feel like this could be done in a better way like maybe the tadpole in our character's mind could learn from others and enhance our character without us inserting it...that would make much mores sense in terms of our character does something that is beneficial but not clearly dumb. Realistically our character couldn't have a visual idea of what it does to the brain so if it was just something like, yeah it offers more power by learning from its kind without insertion it would make more sense and players would be more inclined to do it. But the gross visual also emphasizes that hey, this is probably a really dumb thing to do. Though back to gameplay ramifications I don't know how they want to balance "well we just wanted players to have a bit more progression between levels since those are rare" with something like suddenly losing all that late game if you extract the tadpole/s or maybe a really bad story outcome that maybe ruins your ending if you don't get rid of it or being punished for having leaned into it because at that point there are a lot of asterisks attached to this mid-level progression the say they want us to have. So not sure.
