^Yeah, the confirmed report from Obi-Wan and Anakin that they went to Mortis, would be something that is hard to write around, though yeah it just brings back to the point the EU Authors never really leaned into it, they were vague sure but that's about it.

You can still have Abeloth work, regarding her history you could say the Killik's were going off of wrong/false information seeing as this is coming from their point of view some 10,000 or so years ago and even Luke noted that he wasn't sure he could actually trust what they told him about Abeloth's backstory. He did trust the Jedi Archives of Obi-Wan's report going to Mortis, but again that's vague and can be written completely different.

Though I guess it doesn't really matter at this point anyway, heh. Still yeah, TCW was never part of the EU as been noted multiple times, I guess some authors weren't entirely sure about it, so writing was kinda vague for them in some areas, so as not to override anything or they could always just rework some stuff later.

Seems to me that Legends and Canon both have contradictions, Canon especially since Disney took over

Canon is a concept that in most franchises the fans care more about than the storytellers.

^ Which is a bad thing if you're suppose to be making a whole universe that flows together. As storytellers to a giant universe, the stories should be making sense, not overriding one another. Or if they do, then the storytellers should work to retroactively fix those issues, so they aren't contradictions.

New canon has the advantage that it was created when most basic star wars rules and lore were already established, but it still for some reason decides to retcon itself. The EU had Boba Fett being actually a guy named Jaster Mereel, Clones being the villains in the clone wars, or having multiple wars during the time of the republic before the clone wars despite EP 2 saying otherwise. But legends fixed these contradictions, reconciled them. New canon doesn't do that.

It was actually George Lucas who contradicted the EU more than anyone. Considering how he made it clear that it was always its own canon from his and did not affect his canon at all.

Actually, he did consider it canon, just not as important as his films. And yes, it was important to his movies: Coruscant is from the EU, Aayla Secura is from the EU. He also added labor droids and Dash Rendar's ship to the special edition of a new hope.

From what I've read, George Lucas did not consider the EU canon, but some of his remarks were misunderstood by a few people and the misinformation spread from there.

Might be late to the discussion. But in the grand scheme of things, contradictions/retcons in canon are pretty minimal in comparison to Legends. With an evergrowing franchise, change will be made to accommodate creative decisions and not to restrict creators around a tight box. It is an unfortunate reality that we as fans need to face and understand imo. Generally speaking, they've also been well enough at honoring pre-existing stories like Cobb Vanth, High Republic in JS, etc.