Why can't "Strange Tales from a Chinese Studio" become one of the "Four Great Masterpieces"?

Strange Tales from a Chinese Studio was an important collection of novels in the history of Chinese literature, known as the pinnacle of ancient Chinese novels. However, although it was an excellent literary work, it was not officially one of the "four great masterpieces" mainly because of the following reasons: The content of Strange Tales from a Chinese Studio is rather dark, describing the stories of various ghosts and demons. These stories often conflict with human morality and ethics, and it is difficult to arouse people's resonance. "Journey to the West,""Water Margins,""Dream of the Red Chamber" described the story of justice defeating evil, heroes defeating the devil. These stories were more in line with the values of traditional Chinese culture, so they were more easily accepted and loved by people. Strange Tales from a Lonely Studio was short and simple in structure, so it was difficult to create a deep description of the historical and social background like Journey to the West and Outlaws of the Marsh. It also lacked the emotional description and character creation like Dream of the Red Chamber. Therefore, its influence was not as extensive and far-reaching as that of Journey to the West, Water Margins, and Dream of the Red Chamber. The characters in Strange Tales from a Chinese Studio are abstract and difficult to resonate with. The relationship between the characters and the plot in the story are also complicated and difficult for the readers to understand and remember. In contrast, Journey to the West, Water Margins, and Dream of the Red Chamber had clear characters and simple plots that were easier to remember and pass down. To sum up, although Strange Tales from a Chinese Studio is an excellent literary work, due to its dark content, short length, abstract characters and other reasons, it has not been officially listed as the "Four Great Masterpieces". This is also because it does not conform to the values and aesthetic tastes of traditional Chinese culture.