Is this correct? If you have to disable the "smart" features of the Nest / ecobee for Shabbos every week, then you have essentially killed the thermostat's "smartness", right? It no longer can learn when you're home/away, etc. to have better energy usage.
Then if so, I would think the only useful features of a smart tstat are:
1) the ability to set a schedule and turn it on and off from your phone/Alexa, and
2) the room sensors (which seem to just average out the temp, and therefore you can also just manually play with your temperature for a few days until you learn what temp makes your whole house as comfortable as possible)
In that case, why not just be a cheaper smart tstat? A honeywell, or even this
$4 one...