Does the independence of Outer Mongolia outweigh the disadvantages or the disadvantages outweigh the advantages for China?

Outer Mongolians think they are descendants of Genghis Khan, so they look down on China people after the Ming Dynasty. This idea has been maintained until now.

Let's just say that Mongols are descendants of the Yuan Dynasty and can only ride horses to fight. At best, they are robbers.

The disadvantage is that the capital lacks a buffer zone, but it is not wartime, and there is nothing wrong with it.

The advantage is that the country spends less energy on governance and infrastructure construction. Comparing the United States and Mexico, we can see some problems.