A few weeks ago Google announced it was making changes to it’s Nest line and one of those changes was removing third party support to it’s API’s.
Today Google has also removed support for its nest smart home on both Apple Watch and wear OS, previously the apps allowed you to:
Control the temperature of Nest Thermostats
Switch to Home/Away modes which can automatically turn on your cameras and switch your thermostat to its Eco Temperature
View notifications including smoke alerts if you have a Google Nest Protect
Apple Version 5.37.0 and Android version 188.8.131.52 has removed all mentions of Apple Watch