I mean... In for a penny, in for a pound...
Also, there's the whole thing of you only get the option to take more parasites after it's revealed that you're being protected from them. So you no longer fear random ceremorphosis and figure that when you find a way to remove them you can remove all of them.
Though I do wonder about how their removal will interact with the partial ceremorphosis that they provide... Like, do you get to live normally but with a few bonus illithid powers? Do you become a mindless vegetable due to excessive brain damage? Does neuroplasticity mean you simply go back to being normal?
I suppose if you did just get to live with bonus illithid powers, surely there'd be a bunch of people doing research into that because getting super powers for free either by manipulating tadpoles, or proxying their effects would be pretty high on a lot of people's desires...
