Android allows, sure, but these systems have a chicken-and-egg problem where their sensors aren't exposed in a way that third party apps actually access to the ability they can. The YN455 has this problem today. Plus, it doesn't change the fact that you want that phone-camera to get android updates for security purposes, and now you're back to the fact that most camera makers are pretty crap at user facing operating systems. I think it's an impedance mismatch, really