Disney wastes money on way more green screen and unnecessary bullshit than Denis Villeneuve’s films. Denis wants as much on location filming as possible, and prioritizes practical effects, miniature sets, and so on, which costs more upfront, but saves money in the long run.
A lot of what we see in Dune 1 and 2 is tangible, and can be reused at will - which means a lot less money needs to be spent on filling every frame with made-up visuals throughout the film.
The difference is reflected in the product. It’s the same with Andor, btw. A much more real looking setting. I know they went back and did some location shooting for the Acolyte after the response that Andor received.