I have a Nest thermostat. It works fine without the network. I have a modern car. It works fine without the internet. Several of my friends have Teslas. They work fine offgrid.
It's just nonsense. Stop defending it.
And don't Nest thermostats occasionally have an issue where they default back to somewhere in the 60° range due to a server connectivity issue?
https://support.google.com/googlenest/thread/20510237?hl=en
Doesn't seem like nonsense.
Other fun internet connected car reads:
https://www.wcpo.com/money/consumer/dont-waste-your-money/wo...
https://www.extremetech.com/extreme/306338-phone-app-rental-...
Even if there have been a few historical software bugs that caused some Nests to change temperature, it did not "become completely unresponsive in the middle of winter". Worst case is you walk up to the device and turn the temperature back up. Also, there's nothing in that bug report that suggests it has anything to do with internet connectivity.
A quick google search shows plenty of people getting locked in non-internet-connected cars.
The modern world is complex. Even before I replaced my thermostat with a Nest, my furnace was already way more fragile than my fireplace.
Something, something, "Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith. ... Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something."