I'm curious! It seems like most of my friends never use the tadpole abilities/skill tree in their playthroughs, and I always convince every origin character to eat them now, just to get everyone the Luck of the Far Realms skill. I've avoided using the astral tadpole at all because i'm vain and don't like how it makes my character or the others look.
However in my most recent run, I gave the astral tadpole to Minthara and have been enjoying her flying all over the map during combat smiting everything in sight. I think I will give her all my tadpoles for this run and fully max out the illithid skill tree for the first time.