Well, the app is also tied to specific firmware versions, and both communicate to the Sonos cloud. It's not clear to me whether downgrading the app will make it

Well, the app is also tied to specific firmware versions, and both communicate to the Sonos cloud. It's not clear to me whether downgrading the app will make it lose connection with the speakers (which itself is quite a hassle to re-setup), and whether the two combined would be able to talk to the cloud for very long after that.