I'll just have to say I disagree with you completely on that count. What I find most interesting about these books is
going into the characters heads and learning about prescience and how certain characters deal with it.
Take that away and all you're left with is adventure novels, which seems to me what you'd wish they were, which is fine, there's nothing like a good adventure yarn. In fact that's why I was (at first) a little disappointed with 'Dune' because I was expecting more adventure, but as I've come around to FH writing, I've enjoyed the pseudo-religious sides to his stories much more.