Xerox PARC, that is the real competitor.<p>I am also a programmer, know UNIX before Linux was a thing, as my introduction was with Xenix. But I was already versed in systems like the Amiga.<p>The CLI might be interesting, but a REPL environment is so much more powerful.<p>POSIX is stuck with UNIX System V. It hardly changed anything in terms of OS architecture and they don&#x27;t seem to be adding anything new, in terms of modern systems.