How was the film's backstory confusing and incoherent? I thought pretty much anything you needed to know about the backstory was either explained, or could be easily worked out. It's not as if the story went in any kind of totally unexpected direction with the universe.No, it's not "understandable" that the writers left the movie's backstory a confusing, incoherent mess. And you shouldn't be required to dig into ancillary material to make sense of it.
Yes, the OT was spare on politics, but not on exposition. The first film gave you exactly the right amount of information you needed through a couple of bits of efficient exposition.
There was plenty backstory the first film failed to explain. First off, why did a galactic republic turn into an Empire? Yes, you can assume there was some sort of takeover with political machinations involved, but there wasn't even the slightest hint or throwaway line explaining how this happened. Thankfully, it wasn't terribly important to the story.
Why was Obi Wan in hiding, and why was he in walking distance of the person who happened to be the son of his former best friend? One could assume he was keeping an eye on Luke, but the script never explains this.
I'm sure there is more, but those are just two off the top of my head. Backstory was never terribly important in Star Wars, and was left to the viewers imagination from the very beginning.