I like the idea that Darth Vader was widespread knowledge but Luke doesn’t know because he’s a scrappy farm boy in the far reaches of the galaxy. In my mind, Motti and Ozzel were just narcissists who didn’t believe in the Force and paid the price. Being that the Empire was made in the image of the Sith, self-obsessed arrogant assholes are gonna be the guys in power.
On another topic, the redwood forests in ROTJ were also used for filming for Walking with Dinosaurs because its conifers resemble those from the Mesozoic, when conifers dominated the world’s flora. I think it’s interesting how the Endor moon appearing primeval contrasts the technological advancement that is the Death Star II, and how the Empire’s defeat shows that what is ancient is not necessarily inferior. Maybe Endor could be given a more prehistoric vibe?