Why did the ancients call TCM "the art of Huang Qi"?

Huangdi Neijing, a theoretical system of traditional Chinese medicine, has been formed for more than 2,000 years, which is limited by the historical conditions, natural science and philosophical level at that time. Therefore, the contents recorded in Huangdi Neijing are historical, but the outlook on life, methodology-Taiji, Yin and Yang, Five Elements, unity of form and spirit and theoretical framework-Zangxiang, Meridian, Wei Qi and Xue Ying, etiology and methodology established in Huangdi Neijing. Throughout the historical process of the formation and development of TCM, it is the formation and development process of TCM classics. The classics of traditional Chinese medicine are created by countless Chinese medicine scholars with tens of thousands of years of practice and understanding. The outlook on life, methodology and theoretical framework of traditional Chinese medicine established by classics will continue to inject new connotations with the development of history. The earliest extant medical classic in China, Neijing, is a book discussing medicine with Qi Bo and Lei Gong under the pretext of Huangdi, so it is also called Huangdi Neijing. Huangdi Neijing is one of China's four famous medical works, which has a great influence on Chinese medicine. Huang Qi refers to Qi Bo and Huangdi, while Huang Qi's technique refers to the exposition of Huangdi and Qi Bo in Huangdi Neijing. Later generations called TCM Huang Qi.