I'm not sure the permission index would be very useful. Most iPhone chat apps for example work perfectly fine with zero permissions granted yet provide the opt

I'm not sure the permission index would be very useful. Most iPhone chat apps for example work perfectly fine with zero permissions granted yet provide the option to send pictures, invite contacts, use mic/camera, send gps location, etc if a user is so inclined. With a permissions index, you would likely end up with the majority of apps listing all permissions and users would simply ignore it.