The personal (私) vs. the impersonal (公)
Some artworks are more personal, some impersonal. Both OK, but some balance is needed in either case.
This holds true in all art forms, not just literature. For instance, I don't quite like sculptures by Michaelangelo since his works sometimes seem more like public art (overly impersonal).
So, this is a simple issue, yao shun trivializes as well as mystifies it. Do, it is better not to listen to him at all since his comments serve to confuse but to clarify.