Hi Phil,
On the "Unix(TM) is dead" premise:
Isn't Apple (Mac) OS still certified?
https://www.opengroup.org/openbrand/register/
shows OS 13
The fine article ends with
‘Which means that the last officially trademarked commercial UNIX™ is
Apple's macOS 13, which underneath the proprietary GUI layer is mostly
an open source OS called Darwin anyway. The kernel, XNU, is based on
Mach with an in-kernel "Unix server" derived from FreeBSD...’
—
https://www.theregister.com/2023/01/17/unix_is_dead/
--
Cheers, Ralph.