I don’t know if it’s been culled by now in patches, but when I played there were still lines by the narrator talking about the consequences and “if you do this, there’s no going back” regarding the brain worms. All lies, it turns out.
I have no clue why they cut it, but having it actually impact your potential choices and your endings would be thematically appropriate and make for fun and difficult gameplay choices, I would have thought.
The lack of consequences for the brain worms - and lack of rewards or even mentions for abstaining! - was part of why Act 3 soured me on the game quite a bit. Come on, not even a silly achievement for not using any Illithid power all playthrough?