A lot of younger fans don't seem to understand that any plot holes or major changes like Vader not being the lead character in the OT are due to changes Lucas made along the way. Like if it seems weird that Leia remembers her mother, they think the mistake was made in Return of the Jedi back in 1983!!!!
In many ways this reminds me of Back to the Future 2 with the alternate reality created by Biff. The entire town has changed and Doc and Marty know its changed, but to everyone else its reality. For the millions who grew up on the OT, Luke is the protagonist who redeems his father, and the galaxy is a realistic, "used future" place. To the kids who saw the PT first, the cgi infested Anakin centered galaxy is their reality.