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Race tracks are controlled environments. The stresses a car sees are fairly predictable and replicateable. Tracks are mostly smooth, grades are mild, and temperatures limited. The specific stresses, while great, are very focused, and specific to the type of racing.
The 'real world' puts a car through many different types of stresses. Doors slamming, potholes, speed bumps, washboards, 30 below zero temps, full throttle at cold temps, etc.
Dynos and hot laps can help a manufacturer pinpoint a weak link. But if racing were the only 'proof' of a good car, then it would be the only 'proving grounds' a car manufacturer needed. We've all seen the robotic torture devices implemented by just about every manufacturer and oem. THEY can really test the durability of a car. Mercedes-Benz used to be the best, but their focus on R&D has elapsed over the last decade or more.
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