Doesn't make sense, just ask the permission to use the local storage to the user if that is the deal. But that is not the deal, the deal is that they fear that

Doesn't make sense, just ask the permission to use the local storage to the user if that is the deal. But that is not the deal, the deal is that they fear that more and more developers are moving to webapps instead of developing native apps that need to pass trough the App Store and thus be approved by Apple, and they don't like that.