I kind of wanted to mention it as what I think is a better alternative but I feared it would label me as a systemd propagandist (given the polarising nature of it, even though personally I think it’s advantages outweigh the - often philosophical - drawbacks).
I think that anyone can recognize it as a good alternative for Ubuntu, since Ubuntu already uses systemd (and that's a done deal).
I'd consider myself a pragmatist, so I like systemd because it makes my life easier with the declarative configuration and other nice features (although I recognize that it makes some people's lives harder).
systemd-boot only supports UEFI systems, so GRUB would still have to be an option for legacy systems.
Check out the Arch Wiki page: https://wiki.archlinux.org/index.php/systemd-boot