Disney does not review and approve every raid. Never did, neither did LucasArts. Nor individual quests, stories etc. It's always been about general "don't kill Han/Luke/Leia or introduce time travel and try not to contradict other stuff, especially from movies" guidelines. Other than that, game devs, novel authors, comic book/TV show writers pretty much could always do whatever they wanted in this universe.
My point was simply that they cannot do any storyline that comes to mind as would be the case if it was their own IP (like WOW).