The way Apple talks about new developer features/systems seem like ads for very exclusive clubs sometimes. "If you are already doing this, you can do it here now and we show you some teases, talk to us if you want to know more".

One example for me is ReplayKit... yes I don't know too much about Audio/Video but the little documentation there is it feels deliberately obfuscated and lacking. Better API level docs would help but it absolutely needs more high level guides and examples. One WWDC talk linked on a page is not enough.