I am a purist (spoilers, kind of)
I am a purist. I don't like when directors alter things. I accepted it in "Willy Wonka and the Chocolate Factory". Though it deviated from the book I still enjoyed the movie.
Someone was telling me that Sully (the person who landed the plane on the river) was never really in trouble from the FAA. They just added that to make a better movie. Some very old guy from my church who was a real Monuments Man said a lot of the movie was made up.
Similarly, in "A Beautiful Day in the Neighborhood", Lloyd Vogel was based on Tom Junod. I read an interview or story about Junod in which he said he never had a bad relationship with his father or got into a fight with him. That was made up for the story. Not sure what else was made up. I like it when things are either definitely fiction, or adherent to the truth, not fabricated. But it seems as though a lot of movies do that.