For normal computer use (reading email, watching videos, doing spreadsheets), there are much cheaper and better options available. If somebody wanted a Steam Machine specifically, it'd be for the GPU.

If you needed a lot of GPU compute (for AI or blockchain or whatever), it'd be cheaper to buy or rent a dedicated server with Nvidia H100s rather than buying dozens of Steam Machines.

So the only potential use cases are those that have a significant but not too significant GPU requirement. The only ones I can think of are gaming (which is the intended use case), video editing, and 3D rendering.

Video editing is less of a concern because neither Adobe Premier nor Final Cut Pro will run on Linux (to my knowledge), so you might as well buy a Mac that runs both of those very efficiently and has decent hardware.

So we're left with 3D rendering. If people want to use Steam Machines to render things in Blender, I say "let them", and I assume that Valve does too.