With the introduction of the unwanted play.sonos.com which allows Public-facing access to your Sonos system, an attack vector has been introduced towards IoT Sonos products.
As a minimum, 2 Factor authentication should be introduced to allow users greater security over access to any Sonos websites, but in particular to play.sonos.com.
Another enhancement would be the option to turn off access via play.sonos.com to your Sonos system by implementing a switch in your Sonos profile (not in the app, because I am not upgrading to version 80 just to turn play.sonos.com off!)