I was expecting this essay to mention novelty. What we appreciate in art really comes down to novelty and therefore good taste is the ability to recognize it. Which in turn requires the observer to have a solid background in the genre (i.e. having seen a lot of it already) to judge how novel and original a work of art is. That's why art critics, collectors generally agree on things more often than not: they've dealt…
A well executed refinement of the throughly worn tends to get panned as derivative while foundational works have other sins and lack of polish forgiven. For an extreme example take the infamous Leni Riefenstahl - Adolf Hitler's propagandist. She is studied for her role in pioneering cinematic techniques, if her works weren't novel they would be more a matter of study for historians than cinematographers.