Developing a personal canon isn’t really compatible with how I like to enjoy this sort of fiction with big, sprawling universes. A big part of the appeal of Star Wars, and LOTR, and A Song of Ice ad Fire, etc. is the fact that I’m given access to this world I had nothing to do with creating in which I can poke around and look under rocks, so to speak. I find that picking and choosing what I want to “count” for myself makes me too much of a participant to be able to immerse myself as an observer the way I like to do. So, I guess I just accept the official canon (with Legends as an alternate timeline), and I focus on the stuff I like, and I don’t dwell on the stuff I don’t.
I think this worls well for LOTR becasue there’s only one author and the story was carefully planned out before writing it down. I haven’t read Song of Ice and Fire, so I can’t judge that, but again, there’s only one author and even if he doesn’t plan everything out, it’s relatively easy for him to abandon characters that he lost interest in by simply killing them off.
Star Wars, however is highly incongruent, the EU has countless authors and the difference between 70’s and 80’s Lucas and 90’s and 00’s Lucas is huge. I just can’t think of Star Wars as one big saga anymore.