I second this post. I also upgraded from an older Nest to the 4th Gen
and integrated it via Matter into Home Assistant. Basic control works,
but I'm missing humidity readings, fan control, and accurate heating
status updates (it often shows "heating"...
I took this to the extreme... I factory reset my phone, my Google Wi-Fi,
and hub max, fully deleted the Google Home profile for my home (deleted
all devices from home and then removed the home from my account),
switched internet providers, and moved ...