I don't think that anyone is expecting perpetual support for devices, but a little bit of grandfathering and/or backwards compatibility would give their consumers a little more confidence. But even Apple, often accused of similar tactics, would tread very lightly at actually removing features for fear of people fleeing the ecosystem.
Any device that could AirPlay before can still AirPlay now, for example. Even my son's "iPod" (my old iPhone 4s) can airplay to my older and newer Apple TVs, make a FaceTime call, etc. Sure, it can't do multi-room audio with AirPlay2, or FaceTime group calls, but that device never could. A device like the iPhone 4s is frozen in time and that's expected at a certain point in its lifecycle, but that doesn't mean that my entire network/system should now be frozen in time too. That's what Sonos has effectively done here.
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