Many of us were waiting for Google Assistant integration to Sonos and the most important thing for us was the hope that it brings Chromecast built-in to Sonos but today we can see that... No. No Chromecast on Sonos. That is very very sad. Assistant is useless with some artists and songs with complicated names and often it is not the most suitable way to play music.
And Android users still can't cast any sound from their phones to Sonos (iOS users can via Airplay 2).
Sad but true.