I just went through all the posts in the topic and I'm really, really confused how we went from discussing the relative merits of different stat incorporation into the Illithid Persuasion mechanic to... what the discussion has become. I am also a little sad how quickly it got that way between people who all independently have great ideas on this forum and usually make constructive contributions to the improvement of the game. I'm not here to tone police or butt-in to say my piece, but I think all of you have so much to offer, and the derailing of the topic isn't like any of you.
___________________________________________
Anyway, on to the topic:
Given the Illithids in general use intelligence for rolls, it does make sense to make the Illithid powers use intelligence. On the other hand, based on the many points from the other side of the argument, I don't think such a change is necessary, speaking in the modal sense of the term (
https://en.wikipedia.org/wiki/Modal_logic ). It would be an improvement in the way of consistency, of this I have no doubt; however, I think there are many arguments that would help us reason through the notion that it wouldn't be intelligence. Many of the arguments are stated in earlier posts, so I won't go through them. Ultimately, consistency is nice, but it is really up to the discretion of the developers, given they may have in-world, or mechanical, or story-based reasons to set it up otherwise.