Etiquette and music culture is a great creation of pre-Qin Confucianism, unfortunately, it has been experiencing the process of marginalization. Probably since the Han Dynasty, etiquette has been unilaterally interpreted by the ruling class as the dignity of hierarchical order, including the clothing, chariots, palaces and utensils of officials of different grades. The result of this misreading is that the Confucian thought of etiquette has lost its leading position in the way of governing the country, and has become increasingly marginalized, so that when people mention ancient etiquette, they immediately think of the strict royal ceremonies and civil and military officials who lie on the ground, but the original meaning of etiquette is increasingly forgotten by people.
The most accurate summary of the main point of this passage is that it describes the history of the marginalization of etiquette.