There has been no upgrade to disable GA. There is an outage on GA at the moment though, see https://status.sonos.com, maybe that is what you’re experiencing? I have not read this was caused by an update on the Sonos side of things. Asking for a refund after three days of seeing an admitted fault is a bit much, too.
Reding in this fault a set up by Sonos to move you to SVC seems a bit paranoid to me.
I share your sentiment that Sonos’ move away from Google Assistant on the Era speakers is a bad decision, especially for people who do not speak one of the “Big Five” languages. Like Dutch, also my native language, since neither Alexa, nor SVC is available in Dutch, if that is what you mean. I understand though that you can still command the Era’s with a Nest Mini.
I think you’re wrong about the S1/S2 split. The (ultimate, it must be said) decision to keep supporting S1 systems, affecting people with systems more than fifteen years old, was to be applauded. The choice to split to an S2 version seemed technically unavoidable.
You could give in to Google by buying a couple of Nest Mini’s, though admittedly that would be no solution for the Roam. Not need to sell the IKEA’s.