What's the point of owning books, when you can take the just-in-time approach of having as little inventory as possible and getting books whenever you need them

What's the point of owning books, when you can take the just-in-time approach of having as little inventory as possible and getting books whenever you need them? I think this has to center around the question of whether you can get the books whenever you need them. First there is the effort. A book in your shelf can be accessed on a moments notice. This certainly matters for books you might want to reference. Second is price. Books can often be gotten for a bargain from a flea market or a library that is making space for new books, or a bookstore that goes bust. Third is the possibility that a book will just be unavailable. Maybe it gets banned or maybe society collapses around you and all copies are lost. This risk is low but not negligible. Then there are also other functions a book in a bookshelf performs, apart from easy access. It's a nice aesthetic. And it can help inspiration and discovery.