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
As a Mac user with an Xbox, this thing looks like a breath of fresh air! My Xbox (Series X) is still running well, so I continue to use it, but I kinda want this Steam cube thing, if the price is right. I don't want to buy any more products from Microsoft, and while I tolerate Xbox, I do not like Windows. (I tolerate it at work because I have to, but I'd prefer not to have to mess with it.) I could hang with Linux if I wanted to go down that road, but it looks like this will be a suitable alternative for gaming... if the price is right.
There isn't really any point in comparing this to a games console. There would be no real point valve developing a console because pretty much all of the games on their platform expect to run on a PC so they'd end up having to emulate keyboard inputs as a lot of their library won't really work with a controller in any logical sense, so they might as well just make a PC.
Have you, uh, seen steam input and the new controller with the touch pads? It sounds like you haven't...