Fuck this shit. I'm out...

I still haven't read the book yet but I take this to mean that the 3rd installment doesn't follow the book - that it's more true to zendaya (?; I still don't know who she is; I've been meaning to look up why she seems popular but haven't had sufficient interest to do so) than to the original story.

Or perhaps #3 doesn't generally follow the book at all?

The changes they did to Chani in Part 1 and Part 2 weren't horrible, but lack a good reason to do it in the movies. There is no possible way in Dune Messiah that Chani would fall in with the antagonists other than casting a self absorbed, self righteous SoCal girl so Zendaya Coleman could play her from experience.