For me, this is something I am not a fan of and I think the show honestly handled better than the EU. The idea that Vader is a known public entity, honestly I found stupid. Vader should only be known to the top brass and generals on either side. I saw some comic where the Empire was literally putting him as a public propaganda face in holograms and such. I just don’t think it makes sense. He’s a hand of the Emperor who handles special assignments. Not just an Imperial. I think at the very most, he’d be in whispers of fearful soldiers who might have heard horror stories of a black armored, red lightsaber wielding wizard. To me that is more powerful than the Empire parading him around.
But, I know a lot of EU fans prefer that depiction, so hey, more power to them
Why is it stupid for Vader to be well-known? Scaring people into submission has always been the Empire’s tactic