I agree with you to a point. You do have two other solid brake lights, but I think the flas sing 3rd light wakes you up faster and brings more urgency to the situation. Yeah I know if someone in front is breaking then your in an urgent situation, but some people do daydream. I would lay money that many of us (I have many times) drive on auto pilot a lot of the time especially driving a famiiure road and I just think the flashing light helps in such situations and is why I think there a great idea.
Fair point Dicky.