The Emperors return, no matter how it’s handled, nullifies Anakins sacrifice, Luke’s mission to redeem him & therefore entire point of the OT.
Seems like a bad idea.
I’ve never understood this argument. Vader wanted to overthrow the Emperor since Episode 3, so doing it in a way that risked his life would be more a calculation than a sacrifice. Besides, the redemption of Anakin Skywalker doesn’t hinge on him destroying the Emperor, it hinges entirely on choosing to protect the life of his son. That’s how he is going to win, if you will 😉
Similarly, Luke’s mission is to redeem his father, not necessarily to destroy the Emperor. Luke intentionally goes against the wishes of his mentors in his decision to redeem his father instead of taking revenge on Vader and the Emperor.
The fact that the Emperor survives ROTJ actually clarifies the victory of ROTJ in a thematically important way. Despite being a pathetic film, TROS actually does get this one thing right.