Hmm… I think I see where we are walking past each other on this one. This is a case where, personally, I would rather have the Nest handle all scheduling. That means kicking in the Time to Temp on a regular schedule so it is comfortable before I get home from work. Also, the Nest can handle humidity, etc, by turning on the AC if needed. To do all this in ST, someone would have to essentially reinvent all the Nest functionality since it would become the controller. I don’t think that is worth it. I think it is worth it to have ST and Nest working together much better, alerting each other for motion and presence, maybe setting of trips (that @Dianoga mention), airwave…essentially all the Nest Sense options.
I also think this is a fundamental part of home automation that needs to be addressed by developers…look at it this way. Nest is the “subject matter expert” in the home on HVAC. It has millions of dollars of development and algorithms behind it. ST can turn HVAC on and off based on parameters. But it is not the subject matter expert, similar to how I think a motion sensor is a better option at determining if someone is walking through a room rather than placing a multi-sensor on the floor in vibration detection mode.
As we integrate all these devices, we need to determine who the expert is for each. I’m one that believes that well designed devices, such as the Nest, should be the experts and systems that drive there area of the home. Like I said before, everything should talk together better so the Nest knows that there are windows or doors open. Or, maybe use the temp sensors in a motion detector to know to run the AC a little longer since there is a part of the house that is several degrees hotter than it’s current location. Hell, at that point, Nest could even make suggestions about closing vents partially to balance the house better or interact with ST to command dampers to close if ST knows that the temps are supposed to be.
You don’t want a used car salesman to argue before the Supreme Court (no offense to used car salesman) and you don’t want a 5 term US Senator performing brain surgery on you…unless they were an actual, practicing brain surgeon!