Why is Fang Bi's seal cutting an important gene of China's calligraphy inherited from Shang Dynasty?

In the history of China's calligraphy, from the evaluation of Du's "killing characters" by people in the Six Dynasties to Dong Qichang's "too arrogant" attitude, it is all recognition of knowing each other. Fang Bi's seal script is an important gene inherited from Shang Dynasty to China's calligraphy, and it is a brushwork completely implemented in official script.