Why? Why not replace posix? It's not easy, but it's doable to modify the kernel so you can ditch it (or at least implement non-POSIX compliant structures) if yo

Why? Why not replace posix? It's not easy, but it's doable to modify the kernel so you can ditch it (or at least implement non-POSIX compliant structures) if you want. You can't do that with closed source OSes (except for A/UX which was posix, non posix and simultaneously painful to use).