Why is there less diligent brushwork?

The diligent brushwork is a variation of calligrapher's writing. According to the relevant information, there are three horizontal lines on the lower left side of the diligent word in the block letters written by the brush, and some variant characters appear in the calligraphy works written by calligraphers because they are widely appreciated and circulated. The most prominent is cursive script, which has more characters than regular script, not just one less horizontal. Allow the phenomenon that Chinese characters have fewer strokes or more strokes. The ancients wrote well and were imitated by later generations, which has been circulated for a long time.