Memes

I would say Dune (at least the first book before it goes really fucking weird) has a sort of anti-colonial, indigenous(ish) peoples under occupation themes that Star Wars just isn't interested in exploring. With Star Wars it's basically just "There's an evil empire, okay that's enough, let's go" vibes to OG Star Wars. Like you don't have to pay attention to the political background blurb at the beginning that serves as pasting a veneer of political intrigue at all and the story basically makes sense. It's a War story, whether or not a Monarchy is involved barely matters. It could be "Ambassador Leia" and "President Palpatine" and basically nothing would functionally change. Empire requires no monarchs to function.

Dune does come across as "The Indigenous peoples of Dune hadn't a hope until this one random outsider self insert character showed up and joined their cause and was amazing at everything and was lifted up as saviour because vague prophecy seeded by generations of matriarchal Jedi (Bene Gesserit) manipulation reasons..." It's sympathetic to indigenous peoples in a vaguely problematic for a host of familiar reasons kind of way. Like the world building is great and all but I feel like you could swap Luke Skywalker and Paul Atreidies and end up with a generally better story on both counts.