Re: "manually adjust thermostats"
Too right.
Why do they need to adjust thermostats? The whole point is you set it to a comfortable temperature, maybe with different such temperatures at different times/days, then forget it.
If the weather is warm it won't come on. If the weather is cold it will come on just enough to maintain that comfortable temperature.
If I go on holiday I press the holiday button for the number of days I am away. That's the only manual adjustment needed. No internet required.