Phoronix article: https://www.phoronix.com/news/Steam-Machines-Frame-2026
Also listed here: https://store.steampowered.com/sale/hardware
Valve has already sent support for the new Steam Controller upstream: https://www.phoronix.com/news/New-Steam-Controller-SDL
It’s built like an extra beefy gaming laptop. Many people have no interest in replacing PC parts, they just want something that works (like a console). If you want a tiny desktop with a graphics card you can build your own, and you probably already have one.
Many people have no interest in replacing their car tires and they just want to drive but i’m sure they would be really pissed if once a tire bursts they would have to replace the car.