There were a bunch of missed opportunities for Zigbee to become enshrined in the home.
For example, the first and second-gen Nest thermostats had a Zigbee radio built-in. At acquisition by Google, Nest heavily leaned into the wifi/cloud side for control and the Zigbee radio was squandered, other than for some esoteric “Works with Nest” protocol that maybe 2 other third-party devices supported.
Edit: I stand corrected by the comment below.