I have no interest in Alexa in my house, anywhere. I do have a Sonos system with a PlayBar and 2xPlay:1, but they won't support Airplay 2. I do think my Homepod sounds much better than my Play:1, and I use the Siri integration all the time. Having both, I don't have any plans to purchase newer Sonos speakers just to support Airplay2, would rather spend the money on another Homepod for stereo. Different strokes for different folks I guess.
Or if you previously invested in Sonos and waited for the One instead of going with the HomePod, this is great news! I'm actually taking delivery of a Sonos One today as an early birthday present. Super glad to learn that grouping a One with legacy speakers means AirPlay 2 is basically extended to those speakers (for control through the One).