Like the Mac, the iPhone debuted with a huge technical lead over its competitors. But this time, Apple is determined not to squander its advantage. Instead, it’s front-running as hard as it possibly can. Anything that has any chance of slowing down “the progress of the platform” has simply got to go. And the best way Apple knows to ensure platform progress is by controlling its own destiny in every way that it can. That means, among other things, no middleware vendors, no encouragement of cross-platform development (either explicit or implicit), and complete, arbitrary control over every application’s presence on the platform.
That’s the heart of the whole Section 3.3.1. Apple isn’t doing it just to screw with Adobe, it’s about preserving their platform.