My intuition for aerodynamics must not be as good as yours. But looking at https://caradvise.com/blog/2019/08/17/most-popular-cars-in-t... and https://www.caranddriver.com/news/g36005989/best-selling-car... is interesting. In particular, the way the headlights sit on the front of the car seems to have changed a lot. Cars in the 90s look to have lights that pointed straight ahead. That seems to have evolved over time to a more streamlined position and orientation.