Addendum to my other reply: it comes down to the "not invented here" problem which always invites weirdly complex solutions to problems that don't exist.
Linux is "just" the kernel and every distro invites new solutions to perceived core problems whereas the BSDs have a whole base system that comes from one source, reducing the chance of a systemd popping up there. Both approaches have their ups and downs.
Linux is "just" the kernel and every distro invites new solutions to perceived core problems whereas the BSDs have a whole base system that comes from one source, reducing the chance of a systemd popping up there. Both approaches have their ups and downs.