Why do I feel that calligraphers in the past are not as good as now?

Calligraphy is something you have to write yourself. Look at the calligraphy of famous artists, whether ancient or modern. China's calligraphy has a history of thousands of years, especially that of ancient masters. Many modern calligraphers are still far behind. Beginners can't see the goodness of ancient calligraphers. Only after you have a certain foundation can you appreciate their beauty.