This is an archaic and flawed trope. There's nothing unfilmable about Dune nowadays. Grtandeur? No problem. Effects? forget about it. The "smell of bomb" based on scale of undertaking doesn't mean the same thing it did in 1981.
The story is simple - a charismatic and handsome outsider fulfills a prophecy and defeats evil, and becomes native, and the king of the natives. (Lawrence of Arabia, Avatar, Tarzan, et al)
Now, where it can be incredible is by leaning into the worldbuilding and deep story, but by jumping on the analogs and eerie similarities to Osama Bin Laden ( wealthy young scion of "spice" industry family becomes leader of religious fanatics and leads a jihad against the outsider enemies after embracing their ways) /Iraq war etc.
Lynch created some amazing things - the sets, the costumes, the music and the casting. Some of it, he NAILED. Anyone who critciizes the casting of Gurney Halleck or the Baron or even Chani, can fight me. With a crysknife of course.