I think it’s a difference between having an apprentice (which makes you their master whatever your rank) and being a Master of the Jedi Order, or a Council-level Master, which is a whole other formal thing.
Either way, definitely each to his own, but when canon bends to create new content, the user has a choice of whether to accept the bend in order to enjoy the new content or not.
I’m happy that Vader’s Luke’s father, because that gives me good stories, even though that was a bend of canon not intended during ANH. I’m happy Leia is Luke’s sister, because that gives me good stories, even though that was a bend of canon not conceived until ROTJ. I’m happy that Ahsoka is Anakin’s Padawan, because she’s become one of my favourite characters, even though that was a bend of canon when it was created.
It’s a negotiation between you and the writers: We’ve got a good idea, but you’re going to have to accept this new interpretation of what you may have understood before. And sometimes that means that earlier content loses some value (the Vader suprise, the Yoda reveal), but you have to decide for yourself if the new stuff is worth the bend. For me, new stuff adds way more than it removes, so I’ll take that deal almost every time.
But adding new stuff by bending the rules has been part of Star Wars since the very first movie after the original.
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When George does it, im ok with it. Usually. This is a fan edit, so even George is under scrutiny. In general though, im not for that kind of story telling and world building. The Vader reveal and Yoda are prime examples of even George messing things up. He tried to dove tail each narrative into where they left off in Anh, which limits a lot of the EU people like. If George had left things more ambiguous on some points, then itd be easier to fill in those years with a show like “Kenobi”. As it is, even Kenobi creates dissonance in the lore, like Leia knowing Obiwan so well when clearly it say’s in ANH that she knows of him through his time with her father during the “Clone wars”. Not after the wars.