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"filesystem" is not a name reserved for Unix-style file systems. There are many types of file system which is not built on according to your description. When I was a kid, I used systems which didn't support directories, but it was still file systems.

It's an incorrect take that a system to manage files must follow a set of patterns like the ones you mentioned to be called "file system".

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Terms evolve and now filesytem and "system of files" mean different things,

I would argue that not supporting folders or many other file operations make something not a filesystem today.

Yeah hacker used to not mean someone hacking into a computer and breaking a password, then it did then now it means both that and a tech tinkerer.

You're free to argue whatever you want, but claiming that a file system should have folders as the parent commenter did, or support specific operations, seems a bit meaningless.

I could create a system not supporting folders because it relies on tags or something else. Or I could create a system which is write-only and doesn't support rename or delete.

These systems would be file systems according to how the term has been used for 40 (?) years at least. Just don't see any point in restricting the term to exclude random variants.

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