Isn't technology great, when it works! Sometimes it's one step forward and two steps back.
I like just carrying a Fob in my pocket, push the button on the handle and the car unlocks, push the start button and it goes. But, on our cars the hidden key will only unlock the driver's door. We still have the start button to contend with. I seem to recall when the battery is partially dead you can hold the Fob next to the start button and the car will start.