Creating films from books is nothing new. Since the dawn of cinema, screenwriters have taken the success of literature and used that to create cinematic masterpieces. One of the earliest films I can think of – Gone With The Wind (1939) – was adapted from a book that was published 3 years prior.
However, films are not books. They are materially different media and to make a point of comparing a film to its literary genesis is pointless. If you’re a fan of literature – creating characters in your mind and taking artistic license to join the dots in the story – then by all means continue to do so, but to expect the same experience from a film is foolish.