I won’t be. I’ve set up my old rig, a Ryzen 3600/Radeon 7600 mini-ITX machine on my television running Bazzite. AFAIK it’s quite a similar experience to SteamOS (Launches in Steam big picture mode, can switch to a KDE desktop, immutable distro with flatpak apps), from what they’ve released, it seems my machine has relatively similar performance, it’s about 3 times as big, but…I don’t need a Steam Machine.

I might spring for a Steam Frame headset though.