I think concealed headlamps were dropped by auto makers because of car-pedestrian accidents. If the headlamps are in the raised position and if the front of the car should hit someone, more severe injuries would result than fixed position headlamps that don’t project above the car’s sheet metal surface.
My car has hidden headlamps and I rather like having them. By retracting the headlamps when not being used, the headlamps stay cleaner and that means better illumination at night.
I think the small triangular driver and passenger side vent windows were dropped by auto makers to lower costs. The vent windows were small and could swivel to allow you to direct an air stream at yourself and not have to use the car’s HVAC to do it. The triangular vent windows helped on hot days when the car’s been sitting in the heat and before the AC has the chance to cool off the car’s interior.
