Comment by 0x457

> arch doesn't officially support ARM

Doesn't really mean much to Valve as SteamOS vendor:

- linux kernel supports aarch64 just fine

- user space supports aarach64 just as fine

- Valve provides runtime for games (be it via proton or native linux), so providing aarch64 builds is up to them anyway

The main point of ArchLinuxARM is providing compatible binaries, which isn't something hard to do in-house.