To go x86_64-only was a mistake for Arch. Distros like Fedora or Debian, or openSUSE have universal building systems and infrastructure for building packages for different architectures. Arch just creates unnecessary fragmentation for the GNU/Linux landscape: software need to be packaged for the distro and for the same time PKGBUILDs cannot be reused in general for anything to go full Arch Linux. Not for other architectures, not for servers or LTS. Only for a x86_64 desktop niche. Arch Linux doesn’t scale.