> Or Windows, which is frankly just has better architected internals and abandons legacy UNIX ;-)

Current macOS user, and former NT kernel dabbler and VMS user here. That's highly debatable.

On the kernel side, Windows is still filled with legacy VMS-isms. Eg: Object Manager (object/resource model), named objects, handles, how processes and threads work, vmem, scheduling etc etc

On the userspace side, Windows is still filled with legacy DOS-isms.

Don't me wrong, I love the underlying Windows OS, despite its many quirks, but it's filled with perhaps even more legacy cruft and definitely isn't any sort of step above anything else.

I also don't believe anyone actually runs macOS in a UNIX-compliant configuration. Rather, it's a checkbox on some RFP and nobody is clued into why it's actually there, because all the people that did know have since retired.