That's a good question.
Headlights serve two puproses - to see and to be seen. They not only help the driver see the road ahead but the lit up headlight bucket helps others to see the vehicle on the road. Projector lamps reduce the space inside the headlight bucket that is illuminated and directs it towards the road. It may help illuminate the road ahead better but it makes it harder for others to see the car especially at night.
Local public transit buses have projector headlights and they are remarkably hard to see at night for such a large vehicle. They are quite the risk for pedestrians. Pedestrians have been hit and killed by these buses so the transit authority has installed annoying audible spoken warnings on the bus. Amazing...
Seems like a very expensive downgrade, especially for such a small car.