It's not because of the closed environment decades ago, when the aesthetic was very simple, and stage music was still the mainstream preference in the 196s and 197s, when foreigners began to pop rock music. Pop music only gradually spread from Hong Kong and Taiwan in the 198s. Now we all know that many Hong Kong and Taiwan music in the 198s and 199s were covered from Japan. We have no music industry, and few original music, and rap, rock, jazz and other genres can't enter the mainstream aesthetic. The above is the reason background.
In addition, European and American music is far ahead of us in singing skills.