I don't want to get into "the last 1%" or the "innate human factor," but overall? I think this article is bang on the money. There's a reason musical genres sound distinct; they have certain patterns and techniques that distinguish them.
This is also why, IMO, if you have any pretensions to historicity as a bard, you need to listen to reconstructions of actual medieval music. You need to get the right patterns into your ear before you can recombine them as original works. Otherwise, you're writing modern music, using the modern patterns you've ingested your whole life.