Perhaps if responses were under a different heading, still on my page, still available for those interested, but not gumming up the works – they exist more as beefed up notes and have no place, really, among my more, hopefully, well-crafted work.
I tend to view responses as complete separate pieces of new posts. If I were to post specifically to some aspect of the article, I’d use the notes feature. I quite like this feature which recognises all my writings as my “creations”. I of course agree with you that it’d help if Medium were to add more metadata or context.