Android is another famous example.
https://archlinuxarm.org/platforms
Alas, new Chromebooks are no more. "Successor" Googlebooks are all Android.
ALARM isn't official Arch, so this also isn't an "official Arch supported hardware list". Arch is currently still only x86_64 and everything else is at best unofficial if not just straight up unaffiliated.
(do note that this might change soon-ish™ considering [0], but I think they want to first get their automated build infrastructure ready)
[0]: https://gitlab.archlinux.org/archlinux/rfcs/-/merge_requests...
Regular OEMs will never give their differentiation factor freely.
Even Linux OEMs like Tuxedo apparently cannot get access to hardware specifications, and have to reverse engineer their own devices.