I disagree.. The app interoperability in iOS is achieved, but in a different fashion. You don't have files, but you DO have logins and APIs. Say, Twitter - you

I disagree.. The app interoperability in iOS is achieved, but in a different fashion. You don't have files, but you DO have logins and APIs. Say, Twitter - you want to tweet something from another app? No problem, you implement the right API to do that. Or perhaps you'd like to export a text file, so it can be received by another app? No problem - you use the clipboard & store the file there, or publish the file at a secret URL, and import that url through another app. Is it as easy as save+drag&drop? Not yet. But filesystems also took some time before they were perfected. Give Apple one or two years, and iCloud will offer you as much as the desktop filesystem. And more. Files are not the only way to go. If I want to share a text document with my friend, I don't attach it. I put it into Google Docs, and send my friend a url. Much more convinient - avoids a plenty of mess with versioning etc.