the skies on Tatooine are blue because the skies on Tatooine (Tunisia) ARE blue… They’ve been desaturated on home media (especially in the UHD) but have always been and meant to be a deep and bright blue…
If they’ve been desaturated on home media, does that not imply that they’re meant to be desaturated? You may as well show us pictures of Mexico City and claim that all the Hollywood movies that give it a yellow color grading are wrong. At that point, your complaint is with color grading itself, not the artistic intention behind it.