I was about to discuss/joke about the possibility of systemd absorbing this project. And hold and behold turns out there is already systemd-boot project competing in this space. I was not aware of that at all.
systemd-boot is actually pretty great. If you're looking for a lean fast (multi-os) uefi bootloader systemd-boot is much easier to set up and less fiddly than grub. I haven't reached for grub in years.