Yes, apparently they were only willing to promise it would work within about arm's length of the car! It wasn't that bad, but also it wasn't a heck of a lot better, either!
I don't know if that system uses the same range as when you press the button on the keyfob, but I have read about a hack (probably here) where thieves used a transmitter to extend the range of both the car and the keyfob to unlock the car while the owner is out of sight. That's easier to do the longer the range is.
Oh, no. Yet another reason not to buy a new car. (Hope it can be disabled in the preferences somewhere.)
Technology trying to guess what I want is almost never a good thing. It'll get it right 80% of the time, but that last 20% is a killer, and means I'll have to monitor it carefully all the time.
My aunt had an older Prius, and sometimes when she locked it and walked away it would still see the fob and unlock itself. She had to carefully sneak away from the car to make sure it stayed locked.