Why was Wissler's age-area hypothesis criticized by later scholars?

Clark Wissler’s age-area hypothesis was criticized by later scholars for being overly simplistic and failing to account for the complexities of cultural development and movement.12

The hypothesis, which posited that widely distributed culture traits are older than those with narrow distributions, faced several specific critiques:

• Variable Diffusion: The theory assumes traits diffuse outward in a uniform circle, but in reality, diffusion may occur more rapidly in certain directions due to varying conditions.1
• Modification: Over time, traits may undergo modifications that make it difficult to identify their original point of invention.1
• Population Dynamics: Large-scale population movements can significantly disturb the geographic distribution of traits, undermining the assumption that current patterns reflect historical age.1
• Ecological Pressures: Certain cultural elements, such as sociopolitical units, are more susceptible to environmental and adaptive pressures than others, which can skew their distribution.1
• Contradictory Data: In instances where historical records are available, the data often contradict the reconstructions produced by the age-area hypothesis.1

Ultimately, while the broader culture area approach remained influential, the age-area hypothesis lost scholarly traction because it could not reliably guarantee the certainty of historical developments.12