I didn't use iCloud yet Apple Customer Support was able to directly send a "remote access request" to my iPhone, years ago, which I simply had to press "accept" and they were able to remote-control my phone and see everything on screen. There's no reason the OS can't allow that exact same comprehensive remote access, without asking my permission. There's also no reason Apple can't surreptitiously introduce new back doors with any given iOS update -- especially considering the new "urgent update" functionality they recently introduced.