This is the last book from the original Dune series. Thinking of the first books, looks like a different world although there are references to the beginning. The end is quite open so you can think this is can continue in more books as with the time there is always a new plot/drama. Although there are many things I dont understand. The couple of “Face Dancers” in contact with Duncan? I like the references to Van Gogh pictures like “Thatched Cottages at Cordeville“.
I would never think that Duncan would be present in all books and being a critical character.
But at the end, all is about love and the repression of it like Bene Gesserit do.
And quite moving the last words from the author about his wife death.