Userspace namespaces/chroots/jails are NOT virtualizations, period. Plan9/9front it's composed/run on namespaces and no one would say every window(1) process it

Userspace namespaces/chroots/jails are NOT virtualizations, period. Plan9/9front it's composed/run on namespaces and no one would say every window(1) process it's being virtualized because it has instances of different Plan9 devices such as their own /dev/draw.