What happens if you don't use your turning signal? Cornering lights don't come on? I like the fact that they come on as you go into the turn instead of relying on a turn signal.
Well, you should always use your turn signals when turning or lane changing, but aside from that I find my Model S cornering lamps don't come on until I'm already committed to my turn. At least with turn signal activation, you can light up the area to the side of the car before you actually turn.