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Valve may be working on a direct competitor to the Nvidia Shield
(www.xda-developers.com)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
I use Bazzite on a handheld and there was absolutely some tinkering at first. It's definitely not a simple as boot up and log in.
Depends on your hardware. It mostly just works.