Why doesn't the Romance of the Three Kingdoms in Echo Theater have the original text?

Interpret and appreciate the three kingdoms world from the perspective of history and literature. According to the query of Himalayan official website, Cao Cao Pin Three Kingdoms produced by Echo Theater is mainly interpreted and appreciated by Bao Guoan, the actor of Cao Cao, and Lu Xiaojun, a professor at Wuhan University College of Literature, in the hope of bringing different romances of the Three Kingdoms to the audience, so there is no original text. Echo Theater has been recognized and sought after by many users.