How to evaluate the "seven sons of Jian 'an" in Cao Wei era?

The Seven Scholars of Jian 'an refer to seven writers in the Jian 'an period of Han Dynasty, including Kong Rong, Chen Lin, Wang Can, Xu Gan, Ruan Yu, Ying Yang and Liu Zhen. Among the seven sons of Jian 'an, except Kong Rong, who was killed by Cao Cao because of his disagreement with Cao Cao, all the others finally defected to Cao Cao, and they all got a stable and prosperous life, and their political and economic status was greatly improved.

The last years of the Eastern Han Dynasty was a turbulent era. Confucianism dominated the Han Dynasty, which led to many literary works at that time focusing on education. Although the literary works at that time were deeply studied in some aspects such as the relationship between politics, ethics and reality, the creation of literature and art was relatively neglected. Seven sons of Jian 'an and three sons of Cao Cao formed the main force of literary and artistic creation in the late Eastern Han Dynasty, and made great contributions to the development of literary types such as poetry, prose, and left many precious literary treasures for later generations.

The seven sons of Jian 'an suffered from the turmoil in the last years of the Eastern Han Dynasty, so their works contain many records describing that time. For example, Wang Can's Seven Sorrow Poems says, "When you go out, you can see nothing, but bones cover the plain. "There are hungry women in the road, holding their children and abandoning the grass room." Incorporate the experiences in troubled times into the works, leaving the most authentic records.