They really need to change the approach/"story" of the Star Tours exterior.
It used to be clear that it was a movie set, considering the previously-clearer theme of that area of the park as well as the various indicators (the signage, the director's chair).
Now that they're trying to move away from the "behind-the-scenes of the movies" theme, though, Star Tours is in limbo: it's no longer obviously a "movie set," but at the same time it's clearly not a full-realized environment (it has a flat backdrop that ends at a wall, and a one-sided AT-AT, for goodness' sake!).
This creates the same problem as Dino-Rama: guests think Disney just built it "on the cheap," not bothering to build complete sets or an immersive environment, and just plunking it down like old-style Universal rides. I've actually seen guests commenting (in a YouTube video) with things like "they didn't bother finishing the back of the AT-AT, lol."
I think Disney needs to make one of two choices here:
Easy option: lean back into the "movie set" theme for the facade, with a few props/signs that indicate it to be a set (movie lighting/camera rigs, a new "hot set" sign, etc). While the park is no longer supposed to be a "working studio," it is still supposed to be the moviemaking parts of Hollywood, so a movie set would be perfectly reasonable (certainly more than a halfway-built environment with no explanation).
More involved option: redo the exterior into Los Angeles / Hollywood buildings (e.g., yet another "theater"), such that the guests transition into the world of Star Wars upon entering the structure.