It seems to me that the special semantics are no more or less than a user could trick his/her processes to see with other, purely userspace tools using LD_PRELOAD
I think the point is just that users presumably would like in some cases both to have access to files with FUSE and have normal semantics. FUSE should provide users that capability if possible.
Also, in the proposal, mounting a filesystem affects other processes -- all those owned by the same user see the mounted files with unconventional permission semantics.
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