Soft pen calligraphy, can you practice running script directly without regular script?

Yang Zaichun, a famous calligrapher, mentioned in his works more than once that practicing running script first (not practicing regular script) is far more successful than practicing regular script first and then practicing running script. We have also confirmed this point in calligraphy teaching, which is by no means nonsense. We can look at the formation and development of China's calligraphy, and know that regular script is almost the last one. If calligraphy is compared to a big tree, regular script is actually formed. It's the details of this tree, so I don't trace it back to the source. You need to practice Oracle Bone Inscriptions, small seals and the like first. After all, that thing is too far away from us to apply. Comparatively speaking, practice running script or official script first. After all, the probability of making achievements is much higher than practicing regular script first, which is more conducive to the popularization and promotion of calligraphy.