Frankly, this all reminds me very much of 1998. 
I remember when SB introduced audio into Cubase, and I remember thinking “this is going to be great” - and it was, but it took several years for computers to catch up.
Remember that similar hurdles had to be crossed by both MacOS and Windows to make VSTis practical, and to get a real-time audio stream without dropouts…then the whole business of CoreAudio, ASIO, a low latency audio I/O, proper multimedia instruction sets at the CPU level, etc…I would say a solid 4 years floated by between when I launched my first VSTi and when I was able to actually get full time work done.
Fortunately iOS already has a leg up when it comes to audio, but getting all these audio and MIDI communication protocols sorted out is definitely a work in progress!