The Porsche sports car originated after World War 2 as a modified Volkswagen, retaining its rear-mounted air cooled motor. This concept seemed advanced in the 1930s and perhaps even when the model 356 entered production in 1948. But it was an engineering misstep -- a mistake, even. Rear-mounted engines almost always mean a weight distribution biased towards the rear. This can be useful when trying to get a car moving in snow or mud, but once under way, such as car is likely to rotate 180 degree when traversing a large patch of ice (I know this from personal experience). So while Porsche 911s and related models have always had engines mounted behind the driver, the firm's engineers have labored to tame the effects of the problematical weight distribution.
The engine placement affected Porsche styling from the beginning. With no motor up front and no radiator (in the years before Porsche switched to liquid-cooled engines), the front trunk area could be curved downward from the windshield to the bumper. The rear of the car assumed a fastback design to accommodate the motor and its cooling ducting. The result was a distinctive design theme that has been maintained over the decades because it is clearly Porsche, offering a useful marketing advantage.
I find the early 911 design to be pure and classic. The same goes for the 1950s 356. The Carerra isn't unattractive, but seems bloated in comparison.