We practice calligraphy stroke by stroke in a planned manner because our skills are not good enough and we still stick to the beginning, movement and ending of each character. Still can't use it very skillfully. And every stroke must be thought through and written well.
And calligraphers have mastered it skillfully and can use these starting and closing strokes. Can be freely controlled. They have begun to pursue a kind of freedom. They are creating, not copying.