Book authors spend thousands of hours to years crafting, literally crafting, their stories and characters. It is a work of art and passion to tell a story they are trying to express from inside themselves. Editors and peer reviews help them tell that story, the suggestions for rewrites are to help communicate what the author wants to tell readers. Great stories, written by great authors, is like great classical art. People can feel the effort and authenticity behind the words and characters.
Story writing for big budget film generally isn't capable of great stories, most are terrible, because authenticity doesn't exist. Instead of masterfully crafted, it's plot by committee. Instead of authentic character representation it's inclusivity, by committee. Instead of genuine struggle and consequences it's drama, by committee. I believe that literally the moment the producers think "I can do better" they begin a downward spiral of cutting and splicing hackjobs. It's like taking furniture from a classic master carpenter and deciding you can make it "just a little more modern" by chopping and sanding details off.
There is SUCH a difference between cutting or altering exposition that feels awkward or drawn out in live action vs changing fundamental aspects of the story, plot, and characters to "make it fit."
/rant
(yes I'm talking out of my ass)