Of course, the old Chang 'an also had many disadvantages, which caused Emperor Wendi of Sui Dynasty to move the capital. Otherwise, it will have some influence on its own rule and original capital. At that time, Chang 'an experienced many dynasties, and under the constant change of these dynasties, it was easy to cause some damage to the capital in the years.
In the constant war, Chang 'an is also devastated. If a new emperor comes to power, he must leave the capital. Emperor Wendi finally decided that instead of spending a lot of money to repair it, it would be better to build another one in another place. Although it costs more money, it's better than going to that place.
Emperor Wendi of Sui Dynasty built the capital in different places in order to bring economic development opportunities to other regions at that time. After all, if this place later developed into the capital, it would promote the development of local industry and commerce and the military guard of the city, which was a great change at that time.
Moreover, Emperor Wendi of Sui Dynasty thought that the construction of Chang 'an, the capital of that time, was not very reasonable, but it had its own great disadvantages. At that time, he thought that Chang 'an must be isolated from his own people, so as to maintain some discipline in Chang 'an. The most important thing is that you can better protect the public security of the city. So Emperor Wendi didn't want to continue to repair and maintain Chang 'an at that time, but just wanted to rebuild the capital in other places.
I don't think he did anything wrong. After all, as a new emperor, he can have the right to decide where his capital is.