The major feature the Android app lacks is the "Trueplay" tuning. It relies on a phone to generate and record a sound to map out a room's acoustics, then optimizes the Sonos speaker's output for the room. I've always been wondering if the lack of Trueplay support is due to shortcomings in Android's audio APIs or something like this.
Things like that usually require knowing the hardware characteristics of the device itself as well as some form of calibration range. For iOS Sonos can just buy (or borrow) a couple of iphones every year to generate that data. Doing the same on Android gets a lot harder thanks to the more diverse hardware ecosystem.
