First of all let me say that a great job has been done by Sonos engineers in software development and must be recognized. However, as mentioned by Sonos itself, the use of different IOs devices for sound optimization does not always work correctly. For this reason, no Android device can be used.
As you know, the ipad devices can be used with external microphones such as the UMIK-1 for frequency response analysis.
https://www.minidsp.com/applications/acoustic-measurements/using-the-umik-1-with-audiotools-on-ipad
What about to develop the Trueplay application on IPad with UMIK-1 as quality microphone?
I recognize that such software development cannot be considered a priority, but for installers and audiophiles it could be a powerful tool.
Apologise me for the bad english.