Great insight. You are backed up philosophically by Wittgenstein when he said that there is no
private language - and by Chomsky, by implication, in his ideas of how we acquire language.
Right, everything is a remix, we're only standing on the shoulders of giants, etc...
Still, in German we (of course) have a word to describe the level of novelty and originality:
Schöpfungshöhe