Is the strategy proposed by Yuan Chonghuan to Ming Chengzu feasible? If it is unrealistic, why can it win the trust of Chongzhen?

Is it feasible for Yuan Chonghuan to level Liao for five years? As descendants, we can analyze it from the following steps; First, the thick bunkers all over Liaodong are a strict defense against the late Jin Dynasty. Second, if the Ming army adopts the strategy of nibbling step by step, occupying a place and building a fortress, it can ensure continuous operations. Liao country is completely third, so we can win over other Jurchen tribes and Houjin tribes, so we can fight a war of attrition and it is feasible.

As a general, Yuan Chonghuan has rich combat experience. Before Zhu Youjian became emperor, Yuan Chongzhen fought against the late king for a long time and achieved good results. As a general who often led troops to fight, he had a set of his own rules and had a certain prestige at that time. So when ministers advised him that it was unrealistic, Ming Chengzu believed Yuan Chonghuan.