I disagree entirely. The only reason for creating native apps is to allow apps to interoperate and integrate deeply with the OS. Apps should be free to pass data around with each other, and this absurd level of security overreach, suggesting every app should be sandboxed, is actively hurting the computing world.

Sure, if you're making a game or some browser replacement, then go for sandboxing. But most productivity software shouldn't be confined to that. We need computing to stay open, not to all be closed down mobile OS style.