Yes. I really liked and enjoyed reading this post, but was a bit frustrated by the focus on "thickness". Great art is not great just because it has many layers that take some time and effort to discover, like great cooking doesn't need a large number of different ingredients.

Great art, as you say, has something true, profound, and original to tell us about the human experience, and it touches us deeply in a way that not-so-great art doesn't. It "stops you in your tracks" as other comments here mention. It hits you on the head and makes you a different person, at least a little.

And, there's a magic component to it too. Great art is greater, I think, if you can't guess how it could possibly have been made by a mere mortal. That's where trade comes in. Great art is made by great artisans with a touch of genius, but genius alone isn't enough.