Just like modern music.
For a different reason ... car designers are ‘driven’ to maximize fuel efficiency. For any size car, there is one maximally efficient shape, and every designer wants to get as close as possible to it, while still having some semblance of a distinctive feature.
Another thing to blame on the Feds. The CAFE standards are so high now it limits what carmakers can do. That’s why you never see chrome bumpers on cars anymore.
Government should get out of regulating car gas mileage.