The idea of what is an operating system is completely skewed by the domination unix. What I know of plan9 does not bring much new things in that space.
Things like ocaps or distributed ocaps makes me think we, humans, could be locked up outside the "OS".
Like the rest, it is built on what sort-of works (coming from the past), that is itself biased toward reproducing or implementing known systems like hierarchy (conway law).
When I wrote unix, I meant inspired from unix, not necessarily forks. That is user-space, POSIX threads and processus, hierarchical file system, sh-like programming language to input commands, volatile vs. persistent memory etc...
We are biased toward what we already know.
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