Well, to me there is MS-DOS and there is NT command prompt. They are different things, and I don't like to see them mixed up. Because the NT command language has many of the same commands as MS-DOS, with (sometimes, but not always) the same syntax, many people confuse them, or assume that the command window you get in 2K/XP/Vista is actually called "DOS".
I guess the problem is most acute among the "GUI generation" who are aged under about 25, who have grown up with Windows of one form or another.
I personally feel that this forum has made a rod for its own back by not sufficiently distinguishing between them.
I can imagine that answering questions that ask about "DOS" with a purely MS-DOS based answer would pretty soon ram the point home...