Don't take all of it as 100% correct, it is as far as I can understand.
On arch current rtkit is 0.12-1, on artix it has remained at 0.11+11
The artix package doesn't have a direct dependency on systemd, just dbus and polkit.
You can fool the pkg to be installed as its dependency is satisfied by obarun's polkit, but I think eventually it will create some errors. Artix's polkit has a dependency on libelogind (which now incorporates lib-systemd functionality, lib-systemd-dummy will be removed).
I don't know whether 0.12 has differences in such dependencies and whether artix will update it soon, I'll keep an eye on it.
What I don't understand is that running about the same stuff on obarun and artix, I can live in obarun without consolekit but I don't think I can survive in artix without lib/elogind, which is supposedly the other option. Elogind is a direct chunk of systemd, it evolves in parallel. Consolekit2 has its own independent path.
I don't judge good/bad or good/better either way, it appears to me to be different paths in dealing with the same monsters. Some of the differences between devuan/antix are based on the same dilemmas, consolekit/elogind, it is just that they are dealing with a more vicious monster (debian) than the cute little monster arch is.
By comparison the independent path of Void seems a less stressful one:
[-] dbus-elogind-1.12.12_1 Message bus system
[-] dbus-elogind-libs-1.12.12_1 Message bus system - shared libraries
[-] dbus-elogind-x11-1.12.12_1 Message bus system - X11 support
[-] elogind-241.1_2 Standalone logind fork
[-] elogind-devel-241.1_2 Standalone logind fork - development files
[-] libelogind-241.1_2 Standalone logind fork - elogind library
[-] polkit-elogind-0.115_3 Authorization Toolkit
[-] ConsoleKit2-1.2.1_2 A framework for defining and tracking users, login sessions, and seats
[-] ConsoleKit2-devel-1.2.1_2 A framework for defining and tracking users, login sessions, and seats -...
[-] rtkit-0.11_16 Realtime Policy and Watchdog Daemon
Their rtkit has been stuck on 0.11 as well. So there may be a rtkit fork coming out soon, who knows.