I think it is very theoretically possible to tell a great Star Wars story beginning with the Mustafar duel and then backtracking, but I also think it’s a poor example for discussion because Star Wars “episode” films have an established, defined, rigid structure that does not allow for that kind...
This is a storytelling technique that predates the movies - it’s called “in medias res” (Latin for “in the middle of things”).
It’s understandably not everyone’s cup of tea but is a storytelling technique as old as storytelling itself.