In the beginning there was handwriting and it was useful. It was however limited. Rooms of scribes were required to copy even a single manuscript. Books were restricted to the very wealthy and the average person existed in ignorance.
Next there was the printing press. It was also useful. It required specialized training to produce large quantities of printed material. The printing press brought books to everyone. Knowledge flourished.
Finally, there was the photocopier and it was very useful. It brought the ability to reproduce printed material in any quantity. For a few pennies, anyone could copy anything; yet books remained.
And so it is. Books will always exist, and I am glad.