It’s been supported for years but definitely one of the least user friendly cloud setups

https://www.home-assistant.io/integrations/nest/

Have to set up both a cloud project and device access project and configure pub/sub all within Google cloud services just to get it to talk to home assistant. And then obviously the entire integration is still cloud dependent. And there’s a $5 fee on top of that to get access to these services which while not much is still annoying. The API support is also limited and doesn’t support newer features like the additional temperature sensor pucks (which have been out for like 2-3 years)

There are a few zwave thermostats out there and ecobee can be set up using HomeKit for completely cloudless local control so I’ll be jumping on one of those to get rid of the nest.

I was an earlier adopter of nest and I while it was initially cool my next thermostat will be something with support for local control and better home assistant integration not tied to the cloud