I don't think theory adds to criticism. (Methodology does, for better or worse.) Theory's function is to make criticism self-conscious, maybe even a little sheepish, about its ex cathedra pronouncements.
Paul FryBoth the 18th and the early 20th centuries, however, feature brilliant attacks on originality, and it's no doubt one of the hallmarks of romanticism to care about originality and suppose with a sometimes naive spontaneity that it's all that matters.
Paul Fry