Heterogeneity is the feature. The Linux ecosystem is better off for it (systemd, Wayland, dconf, epoll, inotify are all based on ideas that were in OS X first)

Heterogeneity is the feature. The Linux ecosystem is better off for it (systemd, Wayland, dconf, epoll, inotify are all based on ideas that were in OS X first) and not being beholden to Linux is a competitive advantage for Apple everyone wins.