All of Dune's outdoor scenes were filmed outdoors, to capture brighter light and sharper shadows. Instead of green screens, sand colored screens were used, to eliminate the subtle green glow from the light reflected off the screen. Even subtle things like having actual glass in the windows helps a lot to make a scene more grounded.
Is Dune's CGI perfect? Obviously not. But it does look pretty damn good. And I'd like to see more filmmakers use it as an inspiration when producing other movies.
If you want more info on Dune's CGI, I can't recommend this video enough: https://www.youtube.com/watch?v=uIKupTibxKQ
I've recently watched prometheus right after watching the original Alien and it's just painful to watch
It stars Pedro Pascal before he made it big in The Mandaolorian.