How ARKit 2 works, and why Apple is so focused on AR

Augmented reality (AR) has played prominently in nearly all of Apple's events since iOS 11 was introduced, Tim Cook has said he believes it will be as revolutionary as the smartphone itself, and AR was Apple's biggest focus in sessions with developers at WWDC this year.But why? Most users don't think the killer app for AR has arrived yet - unless you count Pokif(C)mon Go. The use cases so far are cool, but they're not necessary and they're arguably a lot less cool on an iPhone or iPad screen than they would be if you had glasses or contacts that did the same things.From this year's WWDC keynote to Apple's various developer sessions hosted at the San Jose Convention Center and posted online for everyone to view, though, it's clear that Apple is investing heavily in augmented reality for the future.We're going to comb through what Apple has said about AR and ARKit this week, go over exactly what the toolkit does and how it works, and speculate about the company's strategy - why Apple seems to care so much about AR, and why it thinks it's going to get there first in a coming gold rush.

While AR clearly has a role to play in professional settings (e.g construction work, medical settings, and so on), I still haven't seen a general purpose application that justifies the heavy investment in AR by Apple. All demos usually come down to "oh, that's neat, I guess" and "that is incredibly uncomfortable". Where's the killer app?