How is Yu's calligraphy level?

From the perspective of pure literature, Yu's writing has reached an extreme, sophisticated, calm and refined, with no superfluous embellishment and gorgeous colors, but a natural charm. Like an elderly beauty, her eyebrows are vaguely charming. To put it more fantastically, Yu's writing style is like a top swordsman, without fancy moves and fancy special effects, only a simple sword, which seems to have existed since the beginning of time, making people feel puzzling.