Why does Zhuge Liang dislike Wei Yan?

During the Three Kingdoms period, Wei Yan was a controversial figure. I think Wei Yan is actually a rare military wizard in Han Shu Group and a well-deserved good soldier at that time. However, without the reuse of Prime Minister Zhuge Liang, he could not give full play to his talents, which is really a great pity for Han Shu. When it comes to how Zhuge Liang uses Wei Yan, we must first talk about Wei Yan's talents. According to the Records of the Three Kingdoms, Wei Yan "entered Shu with a trilogy and made many contributions". Liu Bei has to be in Hanzhong, so he should be guarded as an important official. Everyone thought it was Zhang Fei, but Liu Bei was "elected as the general of Zhenyuan in Hanzhong and led the satrap in Hanzhong". It can be seen that Wei Yan is an independent general under Liu Bei, and Wei Yan is indeed worthy of great responsibility. From him, "keep Hanzhong and follow him". However, when Liu Bei died, Zhuge Liang took power. Such a general who was reused by Liu Bei did not seem to be reused by Zhuge Liang, and he was no longer left alone. Wei Yan is only allowed to be a pioneer at best. The reason why Zhuge Liang didn't reuse Wei Yan was that there were different opinions. In The Romance of the Three Kingdoms, Zhuge Liang said that Wei Yan had an anti-bone behind his head and cherished talents, so he used it instead of reusing it. I think this is the romance of the novel, which is not credible. What is anti-bone? If Zhuge Liang is really such a fortune teller, it is really the result of being "demonized" by future generations. In fact, Wei Yan did not rebel, and he did die in an unjust case. Here, I just want to talk about the reasons why Wei Yan can't be reused by Zhuge Liang. I think there are several main points: first, and most importantly, there are serious differences between Wei Yan's military thought and Zhuge Liang's. "The History of the Three Kingdoms" said: "Every extension is self-evident, and it is not necessary to invite thousands of soldiers. It is necessary to take the bright road to Tongguan, such as the story of Han Xin, which is bright but impossible." It can be seen that Wei Yanshan made a surprise attack. In the battle of Wei, he always wanted to lead a surprise attack and make peace with Zhuge Liang. However, Zhuge Liang used his troops cautiously and step by step all his life, and there were serious differences in their basic military thoughts. There are many comments on Wei Yan's military suggestion that "different roads will meet in Tongguan". I also tend to think that Wei Yan is more likely to succeed, but it seems a bit too risky for Zhuge Liang who was marching cautiously at that time. Zhuge Liang didn't take Wei Yan's military advice, so he didn't dare to reuse him. Second, Wei Yan's personality is very different from Zhuge Liang's. Wei Yan is "arrogant" and others are "shunned". Wei Yan belongs to such a great and majestic general that others feel "afraid" of him. Zhuge Liang, on the other hand, is "approachable" and Zhuge Liang's principle of employing people is "meritocracy", so Wei will naturally not be entrusted with an important task. Third, Zhuge Liang should maintain the unified command of the Shu-Han army. When Zhuge Liang attacked Wei, there was still a certain gap between the military strength of Shu Han and Cao Wei. It is the first choice to conquer the strong with the weak and concentrate the superior forces to divide and rule. Besides, Zhuge Liang was entrusted by Liu Bei to help the Han Dynasty. Naturally, he should be careful to protect his army. If we reuse a general like Wei Yan, we must divide our forces and attack from different routes. It's not what it was. Without Jingzhou, the strength of Shu Han is not as good as before. Zhuge Liang wants to maintain the unified command and action of the army so as not to lose. To put it bluntly, Zhuge Liang just doesn't trust others' ability to lead troops and wants to command himself. In short, Wei Yan's offensive suggestions are always not adopted by Zhuge Liang, and he himself can't give full play to his military talents, so "it is often said that he dare not shine, can't use it, and regrets it." Wei Yan's failure to do his best is a great regret of Shu Han.