Dual-booting Windows on Steam Machines? Perhaps not all Steam users are familar with the Linux OSes probably due to how different they are compared to Windows. Sure, certain administration tasks still require that we use the freaking command line and it is still the reason of difficulty spike of OS usage. However, the positivity of Linux nowadays is probably the high security and safer privacy and that not all people know what the Linux OS is.
Right now, the only better reason to buy the Steam Machine will be the fact that it has SteamOS as the main OS along with the CPU processors that don't have the Intel V-Pro technology. That may be the important criteria if you are to decide on buying one Steam Machine for safer gaming.