Luke does the same thing Ben did in Star Wars in The Last Jedi to allow the rebels to Escape. The astral projection/fake ligtsaber duel was so Leia and the alliance wouldn’t die. Which is undone in the next film when she dies anyway. I understand it because of the absence of Carrie Fisher, but Leia lying down and willing herself to die like Yoda was horrible. I mean she dies so Ben Solo will be saved and he dies anyway. He doesn’t become a force ghost. The only Skywalker left is adopted.

I agree on Bespin being the best Duel though. ROTJ i like the personal sense of the duel and the chorus, but somehow Vader forgot how to fight. I also hated how the story of Vader tempting Luke to join him from Empire was just dropped.

And Vader instead of having agency is just a puppet for Palpatine again. Like a lapdog. He blocks Luke’s swing, he should just have let him kill the Emperor and join him on the dark side.