Nice answer, though as composers and musicologists we surely ignore this theory or accept it as a paradox, move on, and seek to apply our insufficient knowledge to our subject?
Yes, so you would say a total-serialist work by Milton Babbitt is the same as a Piano Sonata by Beethoven? If so, and from a post-modern perspective, why?
So you don't see Modernism and Romanticism as independent developments, with independent and different aesthetics, within a series of multiple developments. You see them as the two titles some one has given to 1800-1900 and 1900-1950?