Why Did Luke Die?
We all pretty much expected Luke Skywalker to be dead by the end of the trilogy, but having him die halfway through it seemed a bit like an odd move. Granted, episode VIII’s storyline does “finish” Luke’s story and brings it around full circle (him accepting the Force after having locked it out for many years after what happened to Ben Solo), but they could have kept him around in some form.
Why Did Leia Not Die?
This Leia was the best Leia we’ve ever seen, but sadly Carrie Fisher passed away. I’m not sure how they expect to fix this with episode IX coming up, especially if it would have been so very easy to kill her off in episode VIII when her ship blew up.