The Chinese Yang Jian and Li Yuan pursued approximately the same goals as the Romans Stilicho and Aetius. Why did the Chinese succeed in what the Romans did not?
The main advantage of China over the Western Roman Empire was an indestructible agricultural structure; all the barbarians in China had to accept it. In Italy, this way of life was undermined: the latifundia of the slave owners drove out the free farmers.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.