I'd like to see the USB used for the following 3 things:
1. For powering the iOS device.
2. To provide a direct wired audio connection from iOS device to the Amplifi unit.
3. To provide a direct wired control connection from the Amplifi app to the Amplifi unit.
I've only had my Amplifi 75 for a few hours, and there's a lot that I still need to learn about using it. So far I'm liking it lots. I can appreciate the way it uses Bluetooth, and it is often convenient. But I've also experienced circumstances where wireless is highly unreliable - and typically these are the same situations where you can *least* afford a lollipop-up (ex: playing a set at a venue full of techies who're so loaded down with mobile / wearable devices that the RF spectrum resembles soup). If I were playing a live set at a local coffeehouse, I'd be damn sure I had a Plan B in place in case my iPad began spontaneously disconnecting.
I hope I'm not coming off as hyper-critical - just trying to make a case for future function that I'd like to see.
MrP