Except that's not true.
- There are official approved cuts of the Star Wars films, but is their consensus as to what's the definitive version of A New Hope?
- Do Lord of the Rings fans agree with all of Peter Jackson's changes to the original films or The Hobbit?
- Is Deckard a Replicant in Blade Runner? Do fans accept Ridley Scott's interpretation? Do they accept the official cut with the voiceover? No, there's a myriad of opinions, and to me that makes that film interesting because of, not in spite of, the various fan interpretations that have gained hold over the years.
- Are fans of The Song of Ice and Fire obligated to accept the ending that the final season of Game of Thrones produced? Or can they point out the problems in narrative consistency and the problems of how it fits with the other material?
The creators can create, and its part of the material for that subject matter, but the fans are free to decide about what fits or doesn't fit.
I once heard people take about this with other works of art (e.g., paintings, sculptures, literature, etc.) where the creator has their intention, but once it's in the world the audience is under no obligation to accept those intentions and their viewpoint and interpretation just as valid given the arguments once the material is out in a public space for consumption.
Saying that because the creator wants something to be a certain way it negates all other opinions is so limiting. Stephen King's has very strong opinion about Stanley Kubrick's interpretation of
The Shining. Does that negate Kubrick's interpretation as valid because TPTB who created it doesn't agree?
Kubrick is free to create his own version. And King is free to say that version is not the same as his work or fits with it.