Because, as the parent said, as higher level projects, starts requiring systemd, the BSDs will either have to port over systemd and replace their init system, o

Because, as the parent said, as higher level projects, starts requiring systemd, the BSDs will either have to port over systemd and replace their init system, or keep around patches to go around systemd requirments for every application that needs it. Neither is desirable and would take non-trivial effort.