If the permissions on a file don't reflect what file operations are actually allowed, what's the point in presenting them as permissions?
The point is that some people want to use the standard tools, not an arcane ACL editor made just for that job. FUSE is all about making something look like a traditional filesystem so your traditional tools and skills work with it. If not for that, you might as well use a tar file editor instead of mounting your tar file as a filesystem.
The arguments against acknowledge that value, but just point out that the downside -- the cases where the model breaks and the fact that the permissions aren't really permissions shows -- outweighs it.
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