You're still thinking in a 1983 mentality where that's all the the OS was supposed to do. Windows isn't just an operating system. The kernel is the operating system, but the whole of Windows offers much more. Windows includes applications. Superfetch, file indexing, the WDM, Aero, and the driver stacks can all be considered applications in their own right. Don't like them? Fine. Go to services.msc and disable them permanently and leave yourself with just the "operating system." I myself prefer having these applications work behind the scenes for me under the umbrella of "Windows" branding.