An aside, but I can imagine AR done right being extremely useful. I love the idea of being able to instantly have access to information on my phone, but it always requires typing or voice input. I could totally see just looking at something and tapping a button triggering a card that says "that thing you're looking at is this."
While that's just my dream, I'd much rather see people experimenting with new technologies rather than forgoing it with "Apple can't do X right, how can they do Y?" If anything, it could be because Apple is working on Y that X is taking a backseat for a while.