Books, even fictional ones, are written as an expression of a lived experience. An AI can only be fed the experiences of people who have lived, it will never be able to generate something truly novel on its own.
What is it that you are looking for in a book that is an "expression of a lived experience"? Do you get entertained? A good feeling? What if AI can write books that entertain you better and give you an even better feeling?
Or are you looking to learn something, broaden your horizon? What if AI can teach you more, make your horizon wider than any human can?