[animatethrow]

There's a video that is better than the linked article about why Tolkien disliked Dune:

https://www.youtube.com/watch?v=yDqeftRRpB0

This video mentions that Tolkien started a sequel to LotR titled The New Shadow but quickly abandoned it after realizing the story would inevitably be about politics and the evil of Men, about the descendants of Aragorn becoming like Denethor, or worse. And Dune is full of politics and far-future men becoming much more sinister than Denethor. LotR is about good vs. evil, about little people having the power to change the world. In Dune almost everyone is self-interested and Machiavellian, the powerful cruelly use the powerless for their own ends.