Comment by JonathonW

Sonos EOLed their hardware controllers, since they'd moved over to their phone-based controllers almost exclusively several years before (it had been a while since you could buy the hardware controllers).

AFAIK they've never EOLed any speakers. Older speakers sometimes don't get newer features (like AirPlay 2), but they still work and can even play back AirPlay 2 audio if grouped with a newer speaker.