Is it possible that their Audio API is much simpler due to the fact that they control all of the implementations (Hardware interface) of iOS?
However, as someone who has dealt with Android, iOS, Windows Phone, and BB audio APIs, Android's audio API really is just amateur hour compared to Apple's, even to the present day. In older versions it was simply unusable for anything more complicated than playing a sound effect or fixed-length mp3 file. Today it functions for more use cases but still abstracts concepts (like codecs and container parsing) in flawed and inconvenient places.
Windows Phone and BB are still even worse though.
I'd personally be much more at ease if I saw ALSA sitting directly under Qt, but I can understand why they'd want to leverage the huge Android hardware ecosystem.
1. https://developer.ubuntu.com/en/start/ubuntu-for-devices/por...