Movies cannot fully represent the book
Certain parts of the book are inevitably left out to accommodate movie production. There is no “perfect” adaptation.
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Movies often have to omit elements of a book so that it can fit the production; be it plot, characters or other small details. This could affect the story’s overall direction, and confuse those who have read the book first. Movies cannot ensure the full representation of a book's contents. For example, “It” had to be divided into two parts to fully encapsulate the story Stephen King wrote. They were released two years apart, one in 2017 and one in 2019. Compared to the book, which is sold as one volume, there exists a disconnection in the story that the film tells.
[P1] Technical considerations limit the film's representation of the book. [P2] Movies are not good representations of the books they are based on.