At WWDC this June, Apple announced that it would let developers easily port iOS apps to the Mac. This new procedure opens up a door to a broader intention: porting stuff from different platforms to others.
When Apple makes software the usefulness of which may not be obvious, think ahead. To make good AR goggles, Apple needs apps. But talking about future products is harmful, so they can’t invite over too many developers to work on the alpha. That’s why they introduced ARKit now. Apps are made now, to be used now. This makes people interested in new technologies, now. It isn’t very comfortable to poke around with an Ikea sofa model on a phone, but it will be with goggles.
Think Memoji is stupid? I did think so too, until I realised how it will scale in the future. Apple gets people prepared as they get used to having a live virtual avatar now. In two years, it will be indispensable for AR interactions.
When 2020 comes, all Apple has to do is make a porting mechanism for ARKit iOS apps to aOS, and sell the goggles. Instant success.