[theK]

Oh there are masses of zigbee enabled components that are perfectly compliant with those constraints. From big labels to Chinese knock offs. Sure the Sonoses of the world have much more visibility and don’t but who searches will find :-)

[neilalexander]

Indeed - ZigBee is quite good for this. I know from experience that a Philips Hue bridge will gladly pair with and manage non-Philips bulbs (e.g. I have some IKEA ones in addition to Hue), and similarly that Philips bulbs work fine with a non-Philips bridge. You can also block the Hue bridge's access to the Internet and it continues to work fine.