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For Sonos, this topic should be merged with another Chromebook request that has more votes: https://ask.sonos.com/sonos/topics/a_vote_for_a_chromebook_player
The Android app only works when connected to the same network as the Sonos system (WiFi), and not on a mobile network. I'm not sure why, but whatever the reason, it might make it complicated to make a web-based app, since that will require a connection over the web, and not in a LAN. Just a thought.
If SONOS provide a Web Service (described here), then after SONOS need only to develop a shortcut to the URL Web Service for each platform to be compliant, and to provide the same experience on all devices.