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I don't believe there's Bazzite or SteamOS available for ARM devices, which make up most of the "portable handheld" market in terms of device variety

You're right, but I'll mention there's already work in place for getting some of the Ublue images on ARM, so Bazzite ARM is a future possibility

Installing SteamOS on other devices:

You'll note it specifies AMD devices, i.e. x86-64 architecture

Gotcha, I missed that. Thank you.