Computing is full of words for things that are basically metaphors. Icon, folder, directory, desktop, menu, file. All these things have "real" equivalents, sometimes quite different in the way the behave. We tend to forget this as they're been around long enough such that the computer version is a legitimate meaning of the word itself n not just a convenient metaphor. For file and icon they might even be the primary meaning now.
Picking the right metaphor can help people use it. Shelves/collections is a good example. When ereaders were less common, using a book related metaphor like shelf was probably thought to be more helpful.
Anyway it's not worth getting too pedantic over.
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