Technology is at a point where things are "hacked" due to human error. For example, when the mainstream started using wireless 802.11, they put a secret "key" or "password" in called a WEP key. The lack of security is due to a failure on the tech side. Anybody with a smartphone, an app, and 25 sec. to spare can hack a WEP key. The same is not true of WPA2, which believe it or not, not everyone uses. Verizon isn't going to set that up for you, because they want the tech in and out of your house, not wasting time with security.
For all intents and purposes, it would be more practical to try to use everyday phrases like "password" or "1234" etc. to break WPA2, i.e., when people choose a password that's an ordinary word. A smartphone app could run through all the common phrases in no time. So if they log-in to your WPA2 protected network, it isn't the fault of the technology, it's the weak password.
If you like On Star, remote start, unlock etc., just use it. imho they are all unneeded and a waste of fuel to boot. Why would GM have that feature, oh, because idling at 0 mpg doesn't affect their CAFE.