Even though I am a non-iOSdeveloper who likes using a macbook, I can see how it would make sense for Apple to push out a small group of power users if their requirements conflict with features that enhance the experience for the majority of their users, for example something like sandboxing the entire OS away from the user. This would (ostensibly) be good for security and would only be a dealbreaker for a small minority.

As long as iOS developers aren't impacted, I'm not sure what the incentive is for Apple to allow that kind of access.