it isn't the main point of your comment... but why is Chinese worse than Japanese? is it about the font itself being different or about Chinese text containing on average more unique characters?
More characters. I believe there are a mandated 2000 characters that learned in school and used by newspapers. I believe 3000 Chinese characters only gets to 97% and 5000 is still 99.44% [0]
[0] https://lingua.mtsu.edu/chinese-computing/statistics/char/li...