That certainly says more about the certification process than about unix-ness of macOS ;) On the other hand large fraction of UNIX(TM) certified OSes are in fa

That certainly says more about the certification process than about unix-ness of macOS ;) On the other hand large fraction of UNIX(TM) certified OSes are in fact niche Linux distributions (IIRC mostly RHEL derivates). In all it is mostly about nobody giving a damn about the certification outside of very specialized applications.