You seem to be suggesting that a post-PC era is desirable, that being able to make effective use of external storage is inherently problematic and/or that data

You seem to be suggesting that a post-PC era is desirable, that being able to make effective use of external storage is inherently problematic and/or that data should live inside apps from the user's perspective and vanish if the app is uninstalled. If these are your positions, please offer some support for them, as I'm not sure the rest of us see them as self-evident.