This is indeed a question worth pondering. However, I personally think that this issue should have been raised a few years ago. As far as the current situation is concerned, mainland songs are already comparable to Hong Kong and Taiwan songs, and have even reached the point of "going to the next level".
In the 1980s and 1990s, Hong Kong had more contact with the outside world, and it was easier to open up the country and absorb many foreign cultures. Their songs not only contain Chinese elements, but also add many popular elements from abroad. Such songs naturally appear unique among the many ditties full of Chinese flavor, making it easier to stand out.
After all, people are curious. For those new things from outside that I have never been exposed to. People generally show great enthusiasm to accept, pay attention to, and embrace them.
So, those Hong Kong and Taiwan songs that fully draw on foreign pop songs. It will be easier to be welcomed by people.
But now, whether it is those artists from Hong Kong and Taiwan, or these mainland artists. The resources they have access to are similar, and their creative levels are also similar. Therefore, if this issue is put at present, I personally think that it is not true.
Because many people now also like to listen to mainland songs, instead of enthusiastically chasing Hong Kong and Taiwan stars and singing Hong Kong and Taiwan songs like they did in the 1980s and 1990s.
Because, indeed, in the 1980s and 1990s, they had better access to the world and learned more popular music singing methods. Many of their bands can also sing more excellent classic works. For example, the band beyond is still very popular to this day, and its melody is also very popular and has never gone out of style. Wong Ka Kui and the others are all really talented people, and their songs are still very good even today.
But, just for now. Mainland songs are not inferior to Hong Kong and Taiwan songs. Everyone has already reached the same level.