Who said they're not sending up info? I would think that of course they're sending up your location, in order to generate specific cards because of your calendar, location, traffic, pending packages, etc.
Anticipating your needs, based partly on your location, is the whole point of the app.
An obvious question: does this mean that if you have this on a WiFi only device (an iPad, say), than this functionality is not available? Every time I turn off Wifi (on my LTE device) iOS chides me that this will make location services less accurate, so is there some other hack for WiFi, or you, who are so wise in the ways of science?
I was guessing that if cell was not available, the significant change API switched to WiFi ... but as I said, that was just a guess. Rereading the docs, however...
"In iOS 4.0 and later, you can use the significant-change location service to receive location events. This service offers a significant power savings and provides accuracy that is good enough for most apps. It uses the device’s cellular radio ..."
Makes it sound like a Wi-Fi only device will have to use another location API, like the one for boundaries, which would definitely use more CPU power.