Why is there no documentary photography in traditional photography schools?

No one. Documentary photography is a way of photography with the main appeal of recording the reality of life, and the material comes from life and reality. Therefore, documentary photography has the value of recording and preserving history and has the unique qualification as a social witness. A genre is an artistic group or faction with certain social influence formed by artists with certain artistic concepts, aesthetic thoughts, aesthetic tastes, creative tendencies and artistic characteristics. Because no one took documentary photography, documentary photography did not enter the traditional photography genre.