Hmm. I suppose it depends on the specifics of how this virtual file system would work. As I understand Nix people using the system can change their profile (and therefore their view of what programs are installed) on the fly, and the hashing scheme makes it easy to have multiple (and incompatible) versions of libraries and such installed and used by the same person. If this virtual file system were trying to represent everything in a traditional way it seems that this would become more difficult in that case.
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