I have a few quibbles about how artistic Modernism is defined (sounds more like philosophical Modernism), as I would argue that the experimentation of artistic Modernism is more consciously-constructed, while Postmodernism is more self-consciously constructed. I would also, essentially, argue that postmodernism is more the postscript to modernism--a continuation of Modernism that is in many ways less experimental, as it doesn't take the idea of originality seriously, while investigating the things developed by Modernism.

That being said, good piece overall. I think it's interesting, though, that we're getting such a nice defense of postmodernism at its end, as metamodernism is on the rise.