Gentoo GNOME packagers decided they'd make GNOME in Gentoo depend on systemd. I don't see why you expect GNOME developers to help out with another init systemd.

Gentoo GNOME packagers decided they'd make GNOME in Gentoo depend on systemd. I don't see why you expect GNOME developers to help out with another init systemd. That should be up to init system developers. Just implement the same API and/or ensure the API is fixed so it can be implemented across init systems.