Why is the national standard font of Mo You calligraphy so popular?

For children, learning calligraphy is a good start. As the old saying goes, the international regular script of Mo You's calligraphy is very popular, but I don't know if it is as good as rumored. I usually practice calligraphy with ancient posts, such as Ou Yangxun's Inscription of Liquan in Jiucheng Palace, which is recognized as the first regular script in the world. You can copy it with a brush or a hard pen. Teacher Tian Yingzhang, the first contemporary Europeanizer in China, once said that if the calligraphy of an ancient calligrapher is 100% compared with his calligraphy, he can only reach 30% to 40% of that of an ancient calligrapher. Therefore, I suggest that you learn ancient Chinese first, find a good teacher to study hard, so that your child's words can be distinguished from other children's vulgar words, and then stand out. The children's calligraphy will not be worse than the international regular script of Mo You's calligraphy, but maybe it will be better than them. Finally, I said don't forget the ancient calligraphy culture in China, which is not easy to create. I hope everyone can adopt it. thank you