I don't believe Porsche designers are lazy. Rather, I believe they are handcuffed and their creativity is suppressed. They are given narrow parameters in which to design the 911 and only minute changes can be made from one model to another.

As a result, most 911's look the same though not identical. This does provide older models with longevity from a styling standpoint but invariably leads to staleness for the entire model line. Have you noticed that the Porsche super cars, the CGT and now the 918, bare no resemblance to the cash cow 911 line?

There is a message there.