For example in movie adaptations of known franchises changes are made just for change sake so that the writers can show off how smart they are. It would be LESS work to just follow the source material. To be clear: I am NOT talking about changes to better fit a specific medium. I am talking about "look how smart I am, you couldn't predict this twist"-kind of writing that does not improve the story. Still, ego-driven writing seems to be very much accepted?
Same with lighting. No viewer has ever complained about unnatural lighting. This stuff is only made to impress peers.
Why is this kind of behavior so common the industry?