Let me just say that what you guys are talking about goes by a few names... "soundtrack" or "theme" music are good examples. What people usually refer to as "chiptunes as a genre" is not exclusive to chiptune or videogame hardware.
And I know that those arps and patterns can be very complex and you think they are only possible on a tracker, but I'm pretty sure a full orchestra with a clever conductor could play that just as well.
What a clever conductor and his orchestra can play is completely irrelevant in this matter. They could probably play Purple Haze as well, but that doesn't make hard rock any less of a genre.