Much as I liked the books, enjoyed the most recent movies, big fan of Herbert; lining up the Pandora books to reread next. Etc.... people tend to read too much into his world building. Mostly he was just looking for backstory to lightly justify the story he wanted to tell. Pretty much none of the world building holds up to more than a passing scrutiny, and the Butlerian Jihad is no exception. Better to just enjoy the tales for what they are.
Agreed. He didn't have any strong opinions on AI, the idea that AI is the big bad mostly comes from his son's sequels as far as I can tell. Herbert set up the story with computers mostly written out because it's humans who are interesting, and it was humans he wanted to write a story about.