According to a Valve Engineer, the Steam Machine specs outclass the most common PC configurations. The company relied on its own hardware surveys to choose the system’s components. Even as an entry-level option, Valve claims that 4K/60 fps performance is realistic, despite a memory-limited GPU.
It’s not made for the high end user, and as the article said, it’s better than 70%. Most people play on old hardware. It’s a perfect fit for those people