They won't let you call anything but their crappy camera app by intent already, for supposed privacy reasons. As you intimate, what is the point of allowing mobile apps, if they can't access any of the features of the device? Because that is where they are heading, fast. A few crappy google apps that require 24/7 spying to work, and then they "protect you" from everyone else. Sounds like an old school mafia street racket.