First, Li's methods and strategies are not as good as those of others. Even when you become a king, you may not have the general idea of governing the country. As we all know, during the Xuanwumen Rebellion, Prince Li and his eldest brother were killed, and Li Yuan was forced to be a prince. Soon, he ceded the throne to him. Li Jianfei had a chance to kill Li Shimin long before the Xuanwu Gate incident, but perhaps out of brotherhood, he didn't kill Li Shimin, so that he was later victimized. You can say that Li is kind-hearted and cares about brotherhood, but judging from the success or failure of the struggle between the two camps, he obviously lacks means and strategies. Even if he becomes the king of a country in the future, he will be constantly disturbed by it, not to mention creating a prosperous Tang Dynasty.
Second, he is broad-minded, willing to make suggestions, and good at knowing people and employing people, which Li may not have. Li Shimin's appointment of Wei Zhi is a good example. It turned out to be Li's counselor. After Li was killed, he put aside the past and entrusted it with reuse. If he were Li, would he have such a mind? Moreover, Li Shimin fought all the year round, relying on strength to speak, and his men were even more talented, such as Fang Lingxuan, Du Ruhui and Wuji. , and Li is dwarfed. If you want to create a prosperous time, you need time, place and people. Even if Li Cheng is king, but he doesn't have these conditions, how easy is it to create a prosperous time?
Even if Li becomes king, there may not be a prosperous Tang Dynasty behind him. From the perspective of dialectical materialism, the development of history has its contingency and inevitability. And Li's talent and nature can be regarded as accidental, but if they are placed in historical events, it determines the inevitability of their success or failure.