I'd settle for the damn brake lights/taillights being toned down. Maybe with the exception of a car undergoing hard braking there is no point in them being so bright, but the 1,000,000 nit apparent brightness coming from the vehicle in front at every traffic light is painful.

LEDs are a true technical wonder, but they've made so many things so stupid, from the status lights on every single piece of tech, to cars. (And I'd say streetlights too, personally, but I know some people like those).