But what if you could have the movie you want exactly with the story and characters as you envision them. You may not want that still, but I guarantee you there are people that will.
I loved Annihilation and it's sequels, not knowing what I was getting into. I would never have come up with those stories. And a one to one translation of the text to screen would have left us without an interesting movie on its own right.
But yes you're right, some people are probably seeking that in their media consumption.
its not like you're writing a story for yourself.