All cars are supposed to offer a maximum of performance, passenger room and cargo space, and a minimum of fuel consumption and cost to manufacture and maintain. There are only so many ways to technically achieve these goals. Cars tend to get more rounded edges in order to be more aerodynamic. The trunk lid is high in order to offer greater cargo space without imposing on the passengers. The design of the trunk lid is also approaching the 'optimal' shape for easy loading and access.
Windows are large and pillars are thin for better view.
The lights, both back and front, are homing in on the design for maximum visibility. The wheel base is decided on basis of good turning ability both in the case of parking and at high speeds. Everyone is simply trying to design 'the perfect car' so it is natural that they are all headed in the same scientific direction.