I love Clear and Paper and there are more examples (Tiny Piano, Apple's utilities). But I think the difference is this: It is great if an app "becomes the device" and does its task better than UIKit could do it. But if an app does 'boring' stuff like drilling down into forms to send them, or giving the user a table of settings, then what's the reason to leave UIKit? There is absolutely no UX advantage here, to the contrary, it even has the typical "designer's back buttons" again that don't show where they lead to.
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I love Clear and Paper and there are more examples (Tiny Piano, Apple's utilities). But I think the difference is this: It is great if an app "becomes the device" and does its task better than UIKit could do it. But if an app does 'boring' stuff like drilling down into forms to send them, or giving the user a table of settings, then what's the reason to leave UIKit? There is absolutely no UX advantage here, to the contrary, it even has the typical "designer's back buttons" again that don't show where they lead to.