A faceted classification system sounds pretty unnecessary in this context. I'd like it if I were looking for a new book to buy, but I really can't see ever using it on my existing library. At that point I already know the specific book I want to read and just want to find it.
> A faceted classification system sounds pretty unnecessary in this context.
If by "this context" you mean exactly the use case you describe, then yes. If you are always looking for books you already know of and can name, there is little point in further classification.
Another potential use case is that I have tens of thousands of books and I am looking for English-language fictional books about scientists and monsters by authors born in the 18th century.
Again, I haven't looked closely at the app and chances are that it doesn't really help in that use case either, but I meant to explain the concept of a "library" to someone who did not understand it, and why a simple hierarchical file system may be an insufficient abstraction for library classification in general.
