Why does Sun Quan think that Jia Xu's appointment to the post of Sangong is ridiculous?

Why does Sun Quan think that Jia Xu's appointment to the post of Sangong is ridiculous? The sentence "Sun Quan laughs it off" was cited by Pei Songzhi as another biography of Xun Xu. It's Ren Wei. His age is similar, so what he said should be credible. I thought Sun Quan's reaction was a unified reaction to the three people after Cao Pi's appointment, not to Jia Xu alone. Who are the other three? Stuart Huaxin and Sikong Wang Lang. Hua Xin and Wang Lang are both obstacles to Sun Ce's unification of Jiangdong. One of them surrendered without a fight, and the other was chased to Jiaozhou and lost his way. Both of them have met Sun Quan and know who they are. Therefore, Sun Quan knows that the candidates of Sangong will laugh. You treat two people we don't want as three, and that's all. If we say that Jia Xu's talent is not qualified for public office because of his "ability", what did Wang Can do? And Stuart, who was appointed by Liu Bei by the nose, what ability does he have? Sun Quan doesn't laugh at Xu climbing over the wall, Wang folding rice, but laughing at Jia Xu. Both ability and word of mouth are obvious.

The "three public posts" are empty posts and eulogize posts to well-known and well-known elders. The focus has never been on ability but reputation, which is wind review and positive energy. Therefore, model intellectuals such as Xu Jing, Hua Xin and Wang Lang, whose name is more than reality, are in line with the values at that time. And Jia Xu, ability is very strong, but virtue is not obvious. People with a bad reputation will be ridiculed if they work in Sangong. Xelloss's appointment of Jia Xu as Qiu, in people's eyes, is pure chaos and reward. In fact, xelloss himself admits that it is a disguised reward. Later, after Zhong You became prime minister, Cao Pi was very satisfied with the new three public organizations composed of Zhong, Hua and Wang, and enthusiastically praised himself: It really used a group of great men, and I am afraid that future generations could not catch up. Completely ignore Jia Xu. The status of the three publics is respected. In principle, there is no suitable candidate, and it is best to be vacant. Xelloss took this position as a gift to reward Jia Xu, and Jia Xu helped him speak when he got this position. Sun Quan laughed at him. Is it inappropriate?