Markdown was intended to be simple enough that everybody could roll their own code to translate to their "real" markup language of choice. Everyone did, but because markdown was a hack in the first place, the quality of implementations is pretty inconsistent. (Which is fine, because rolling your own markdown -> html translator is easy -- much easier than writing your own html -> anything translator -- and well within the reach of even beginner programmers.)

I avoid markdown because I don't like markup in general (and because I think styling of text is rarely useful), but if I need to work with it, I will whip something up to do the translation. A couple lines of sed is sufficient for handling whatever tiny subset of markdown is actually present.