Is it? Seems to me they use Nuremburg and how fast you got around it. But that doesn't tell you anything about how the car handles when in a corner and the tires are breaking. Add to that pavement and weather condition, tires in use. Driving a car hard is an art. Most can't do it. I can't.Analogy doesn’t hold up under scrutiny because what constitutes performance is clearly and measurably defined in cars and not so in audio...that is why 1930s theater speakers can sound at least as real as a modern megabuck speaker...
Then there is comfort and fit to the driver.
Also durability. How long does the engine, transmission, suspension etc function as intended.
The old 911SC 3.0 was loved by many because the engine was bullet proof.
The Targa was a nightmare to keep the roof from leaking.
There are lots of ways to measure a car.