Earlier quoted context omitted.
The systemd/RH relationship is complicated. Red Hat doesn't use most of systemd's features--they don't even ship systemd-networkd on RHEL8, preferring NetworkManager instead. On the flipside, I see more use of systemd's features on Arch or Debian. I don't think you can frame systemd as some kind of RH trojan horse when so little of it makes it into RHEL/Fedora.
So while Arch ships everything, and being Arch it doesn't really have a default, its recommended networking system isn't systemd-networkd but rather netctl, which is basically everything systemd-networkd should have been.
`netctl` was explicitly written because systemd didn't have a network daemon. The past 3-4 years the community has in general recommended against using `netctl`.
It was never removed from the ISO because the releng maintainer didn't put that much thought into it, but I'm happy to tell you `netctl` was replaced with `iwd` on this month ISO release.