systemd removes the last bit that ever made any sense with systemd.
https://linuxjust4u.com/linux/systemd-260-sysv-removed-linux-upgrade-guide/
Linux Just 4 Usystemd 260: SysV Removed and What Sysadmins Must Do Now - Linux Just 4 Usystemd 260 permanently removes SysV init scripts and raises the kernel baseline to 5.10. Here is what breaks, what to migrate, and how to audit your Linux servers.