European and American superstars don't appear so frequently in China. I think there are several reasons. First, the domestic examination and approval procedures in China are more complicated and strict. If you want to come to China for a concert or participate in any activities, you need strict approval procedures. Moreover, due to the cultural differences between western countries and China, there will be conflicts and differences in song content and performance form. In addition, European and American songs are often bold and wild, so that some sensitive content cannot be approved in China.
Secondly, the mass base of European and American music is not big enough. Even though there are many people who like European and American music, not so many people will go to the scene or see these European and American superstars. On the contrary, hallyu star will be more popular in China, while European and American stars are not so willing to pay big money to watch their performances, although their live performances are really great. Moreover, with the rise of China singers in recent years, people tend to favor domestic singers rather than idolize foreign singers.
Finally, there are practical problems of payment and cost. Every concert, every performance, the organizers must want to profit from it. But if they find that this will not only make them profitable, but also make them lose money, then I don't think anyone wants to do such a loss-making business. In addition, the cost and appearance fee of European and American superstars are very expensive. The organizers found that the effect was not ideal when they forced it. As a result, European and American superstars will come to China less and less.
In any case, music has no borders, and each kind of music has its own unique style.