Except I think it's all a gimmick, a forced air system without zoning isn't that effective in managing temperatures across multiple floors. Also, not to mention, the Nest only has a single sensor and cannot effectively monitor a whole house.
Basically these features are gimmicky targeted towards the tech user.
Now, if homes had zoned HVAC and the nest could control each room independently that would be amazing.
The nest does support zoned systems, however the drawback is you have to install a Nest in each zone, and then they can all communicate via wifi.