For better or worse, I think he is right. Non-uniformity has been the norm in Apple's apps for a while, Garageband, Aperture, every iTunes release, among others. I believe the majority of third party mac developers used to be pre OS X developers, and because of that they had and incredible amount of respect for the HIG, but now, the (problematic) apps in the Mac App Store are coming from iOS developers, who didn't gr…
Maybe. But if the HIG is not that important anymore, I think that should also imply that Apple should allow for other UI toolkits in its stores, such as Qt.
If I'm reading this correctly ( http://pastie.org/1236378 ), the only major requirements are that apps don't screw around with the HIG too much, and they don't use "deprecated or optionally installed technologies (e.g., Java, Rosetta)". Admittedly, the only Qt app I recall using on OS X is Last.fm, but that seemed to be mostly HIG-compliant (a couple things felt a tad out of place, but nothing major).