Ehm. What systemd advocates use arguments like "we don't have anything else" or "Red Hat forces it"? Those are the arguments of systemd detractors.
I am a systemd detractor and I happily use Void with runit, so I would really never say that we don't have anything else. I don't know what the magical features are of the ever growing giant squid that is systemd that people swear they can't live without, but I haven't encountered them.