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> The biggest central problem with Unix mount, apart from synchonous/trusted I/O, is that the things that are exposed to the OS through mounting are only files, and never processes ...

With plan9port https://swtch.com/plan9port/ you can mount processes on any UNIX.

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Sorry, I'm not as familiar with Plan 9 as I should be. I know that it has (and emphasises) user-space mount, but it is my understanding that the entities exposed to the OS through mounting are files, not processes. (Including through /proc, which exposes a directory tree of files containing data about processes, not processes themselves.)

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