Dvorak takes his knocks from the Mac cult regularly. Most of the times I suspect unfairly as he fails to effusively gush about the obvious superiority of the Mac platform. As a result, the Mac cult loves to hate Dvorak, and Dvorak loves to tweak the Mac cult in the same way a cat plays with a mouse. I agree it’s a cheap shot from Dvorak and despite that I still enjoy his work.
Based on Adam's comments, I agree with Adam's sentiments. Where Adam says "the soul" of the platform, I'd go further and say that the soul is really the tight integration of UI in the OS as well as across applications. Apple got that way, way back and continues to bring it forward. Dvorak's wrong view is that this is the same as eye candy. To best demonstrate the fallacy and grotesque simplicity of this viewpoint run KDE. I like KDE / Linux. Don't get me wrong. But you can almost see the KDE gang looking at Mac and drawing the same conclusion; "it's the eye-candy that makes a great user experience. Just make the icons dance around and throw in the odd transparency and dimming effects and the rubes will love it."
Flat. Out. Wrong.
You have to assume an arrogant and malicious view of the end user to reach this conclusion. While the "average" end user is not an engineering whiz, comfortable on the command line, this doesn't mean putting up pretty undulating pictures is what he or she wants to see. We Mac users have tight intra-application integration both UI and core system services. Learning one app and you're 80% of the way towards a new app, that is, if they follow Apple's UI guidelines. We've had it for so long we take it for granted. Our zealous user base clamors for it and hell rains down on the poor developer who misses a beat. Chances are you won't hear "Strict UI guideline conformance!" rather, "I can't figure this out!"
So, Dvorak doesn’t get it nor would I expect him to have the capacity, given his bias, to get it. I’d rather leave his comment for the albatross that it is and move on.