in any self respecting independent posix benchmark MacOS is almost always leading or at least in the top 10% at being the worst one(s) in posix compatibility, iOS completely hides all and any UNIX-like userspace to the end user, MacOS hasn’t cared about posix compatibility and unix-likeness more than enough to get a cert to claim posix compatibility and ships outdated versions of many CLI utils and many things in which although outside of POSIX are expected to be in a certain way in unix-like OS which MacOS simply doesnt follow or care at all (e.g basic FHS, /home etc…)
iOS is a fork of MacOS, which is actually UNIX
in any self respecting independent posix benchmark MacOS is almost always leading or at least in the top 10% at being the worst one(s) in posix compatibility, iOS completely hides all and any UNIX-like userspace to the end user, MacOS hasn’t cared about posix compatibility and unix-likeness more than enough to get a cert to claim posix compatibility and ships outdated versions of many CLI utils and many things in which although outside of POSIX are expected to be in a certain way in unix-like OS which MacOS simply doesnt follow or care at all (e.g basic FHS, /home etc…)