I think this is mainly because the level in Europe and around the world is catching up and now closer to the Chinese players. Also they are having more opportunities to play against the Chinese players and get used to their style and level. I feel the overall level in China is actually not as strong as before and there are less kids starting out in the sport, before there were many players from China who could beat the top European players but now only a very small group of them
Lastly the training methods and clubs in Europe are much more professional now and as I said the level is getting closer to China and being able to beat them more often!
