I don’t understand why you people skip these movies.
If you don’t want to watch bad movies, just don’t watch the prequels at all.
Either watch everything or screw PT entirely. The entire PT is not important to the story of OT.
Keep it all or skip it all.
Because I do think ROTS adds something to ROTJ. It wasn’t executed nearly as well as it could or should have been, but it does add some depth to Vader’s character that makes the climax of ROTJ that much more powerful. Knowing how and why he turned to the dark side makes you more invested in his arc and makes the moment he turns back to the light pack more emotional punch as a result. And unlike the first two, it doesn’t outright ruin his character and pretty much everything else about Star Wars.