What are the shortcomings and weaknesses of ancient chemistry in China?

In ancient China, the craftsman tradition was separated from the academic tradition, and some incisive expositions of matter by scholars failed to attract the attention of craftsmen and were put into experimental verification. Many valuable experiences of craftsmen are often ignored by scholars, and many technologies are even lost again. Another example is that most equipment in China was opaque at that time, which made it difficult to observe the change of reaction; Do not pay attention to gas collection and research; Just satisfied with the concept of yin and yang to explain the complex material changes; Generally speaking, the quantitative relationship in chemical changes is often not paid due attention to. These are the shortcomings or weaknesses of ancient chemistry in China.