While it has nothing directly do do with init, there is a lot of cooperation that goes on between systemd and systemd-boot, that does not work with other grub f

While it has nothing directly do do with init, there is a lot of cooperation that goes on between systemd and systemd-boot, that does not work with other grub for example. You can from systemd control the reboot and tell it what to reboot and stuff like that. Lennards talks about this are quite informative. The other advantage it has, is that it uses a simple single file per OS based standard. I would love if GRUB adopted this model too.