Yeah, that's perfectly fair. I raised my question because it occurred to me this kind of sells the operating system short. In other words: even DOS could run Doom (with some help with a memory extender I guess, which is a technology we can all very happily not worry about anymore).
I think the thing is, Doom was originally written __for__ DOS. Part of the cool part is porting 3rd party software to my OS that wasn't originally written for it. That was part of my reasoning at least.