Why did cursive script precede regular script in the history of calligraphy development in China?

There is a storyteller in front. When marching and fighting, the writing speed of documents is required to be faster, so the brushwork of official script is simplified, unnecessary pauses are omitted, and Lian Bi and Si Qian are added to produce a cursive script. It's actually wrong. At that time, it was said that there was a saying about official script, especially Han bamboo slips, because there were frequent wars in the late Qin Dynasty and early Han Dynasty, but official script was Xiao Zhuan. Think about how hard it was to draft documents with Xiao Zhuan in case of emergency. So Li Qiu came into being in the army at that time and was widely used. At present, the earliest official script found is the Han bamboo slips in the late Qin Dynasty and early Han Dynasty, and cursive script exists in the earliest Han bamboo slips. This is a cursive script similar to official script, called Cao Zhang. In fact, Li Qiushi evolved from people's decreasing strokes through Cao Zhang. At present, the calligraphy circle thinks that the earliest cursive script is directly simplified from Dazhuan. Throughout the history of calligraphy, cursive script has played an important role in the formation of beginning of autumn, regular script and even modern simplified Chinese characters. As for practicing calligraphy, practice regular script first, because regular script is closest to the well-known imitation of Song Dynasty, with stable structure and easy to master. The most difficult thing for beginners to master is the basic stippling, so it is better to write regular script.