Just read a long thoughtful analysis of DV Dune by someone who loves the books. Their analysis was that every choice in the DV movies is about focusing on (1) Paul's dilemma, (2) the aspect of religion as a tool for power.
Removing the mentats, Guild, the Emperor, CHOAM, etc from the core story and putting pairs in opposition, like Chani and Jessica, and North and South is all about this focus.