I love the idea of smart devices; it is a pity that so many are stuck in with an intermediary mystery server.
While it is impressive to control my heat settings from half way around the world, it should be noted that there were off the shelf devices for doing this 40 years ago which didn’t require intermediaries. They were quite popular in my area to prepare your cabin for a winter visit; but outside of that, the primary use case has to be playing pranks on your family. Truly a capability in search of requirement.
I would be more impressed with a modern thermostat which let me fondle it without leaving the comfort of my bed, and didn’t require an intermediary. I don’t know, exactly, why I am not keen on having my thermostat usage patterns bounced off a mystery server; but the inability of these companies to explain why it is necessary feeds my aversion.