wrt #4: No, the big thing about Plan 9 is that each process has its own view of the filesystem, and can modify it without any privileges. This would break the u

wrt #4: No, the big thing about Plan 9 is that each process has its own view of the filesystem, and can modify it without any privileges. This would break the unix security model because unix has setuid. Quote from https://utcc.utoronto.ca/~cks/space/blog/unix/WhyNoUserNamespaces https://utcc.utoronto.ca/~cks/space/blog/unix/WhyNoUserNames...: > Imagine that Unix had this feature and still had setuid, and you would like root privileges. No problem; make a custom namespace for /etc that has a version of /etc/shadow, /etc/group, and /etc/sudoers that have known passwords and list you as authorized. Now run sudo. Done.