Rather, it shows the charming lack of evolution.
For decades, the Porsche 911 remained on the same basic platform. Only in the mid ‘90s did the car take on a fundamentally new form, and even then it was a gradual step towards water-cooled modernity, at least as compared to the rest of the car industry.
Watch the video by Donut Media and you’ll see how the fundamental shape and rear-engine sports car design remains true.
Now, about the durability of the air-cooled versus the water-cooled cars...