Where are all the Steam machines?

Even if we had Steam Machines the video game makers are not cooperating with Valve to port their games to Linux. Your SteamOS based Steam Machine would have to connect to your Windows PC and play games over the Cloud in order to have games to play.

The Steam controller, they went too fancy with it. Didn't design it very well and made it very expensive to make. The Xbox One controller is much better and you can get a Windows driver for it and make a Steam Machine with Windows 8.1 on it to play Windows games with Steam.

Valve didn't keep up a good communication with the PC makers in making Steam machines, so they delayed or made Windows boxes instead.

At one time Microsoft wanted to make a new standard called ACE Advanced Computing Environment with Microsoft OS/2 and MIPS CPUs with a dozen PC makers. They too had communication issues and Microsoft OS/2 got turned into Windows NT and the MIPS version of NT was used on those machines instead. As of Windows NT 4.0 MIPS was no longer supported. But the MIPS NT 4.0 machines could run 286 DOS programs for some reason. Yet who wanted a MIPS based NT system when an Intel X86 NT system was cheaper and ran more software titles?