I completely agree, by "openness" I meant the lack of ACL/permissions for different data. This is improving on Android, but I don't keep up with it anymore so I'm not sure how much they've caught up or if what is released/planned is marketing hype.

Of course, Android has always sandboxed and prevented apps from talking to each other directly, but the restrictions on iOS have also always been much higher. iOS has never had the issues Android has had with SD cards. As someone who became an Android developer almost right after it came out, it was this freedom that attracted me.