First time I watched it in theaters I hadn’t read anything Dune and honestly hated it because I had no idea what was going on or who people were or why they were involved. After reading the first book and learning more about spice, the spacing guild, the witch covenant and going back in I freaking loved it. Same with my wife who isn’t usually the biggest SciFi person, took her 3 watches but she loves the universe and the music.
I thought the full costume stage singing pieces made sense and the rest were odd but they do work because
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The rest did happen during rather stressful or emotional times so would make sense it was his delusion