Books are a vestigial organ. Nobody uses books as their primary mode of accessing information about the world anymore.

What is interesting is that the cultural mores around this vestigial organ have persisted to such a great degree. Harry Potter Books are a psycho-social mechanism of self-construction more than an actual work of fiction. The phenomenon of "I am a bookish person who reads Harry Potter" as a psychological thing that people do is larger and more significant than the actual story of Harry the young wizard. Likewise, the phenomenon of "I am a successful luminary who has written a book" is more important than the actual content of the book itself. Celebrities paying ghostwriters to write books and going to book signings to sign a book for people who will never actually read the book. A perfectly airtight simulacra.