Yes and no on replaceability. On one hand you could argue within a range one book is as good as another. However for many people, once they come to enjoy an aut

Yes and no on replaceability. On one hand you could argue within a range one book is as good as another. However for many people, once they come to enjoy an authors work, that particular author is "not replaceable" because you want his unique writing voice/take on things/etc. Until you find those authors you adore to that degree, however, yes books are totally interchangeable after a certain quality threshold is passed.