They probably need it to have more targeted patches compared to the steam deck that are not going to fly for Arch Linux ARM which aims to support a wide range of hardware.
Experimental Build Of Holo Core Published: Arch Linux AArch64 For Valve's Steam Frame
3 months ago by steam_lover to c/archlinux
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As one of the comments on the site points out, there's already Arch Linux ARM (ALARM), which needs support, so I presume they don't want to colobarate with them for a reason.
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