Su Shi's name "Shi" is said to be understood as his father's hope that Su Shi would not ignore the seemingly unimportant "exterior decoration". How to understand this statement?

The famous poet Su Shi and Zi Zizhan; Su Zhe, whose real name is Zhe, is Ziyou, and the names of Su Shi and Su Zhe are all related to "car". Su Xun explained the reason why Su Shi and Su Zhe were named in the article Named Two Sons: Wheel, spoke, cover and wheel are all important parts of a car, and they are indispensable. Stone (the crossbar in front of the car, used as an armrest when standing far away from the car) seems dispensable, but without stone, the car is not complete. Su Xun named Su Shi "Shi" in the hope that he would not neglect the seemingly unimportant "exterior decoration". All cars will have ruts, but they are not in the credit book. But if the car breaks down and the horse dies, the disaster will not affect the rut. Estrus is between misfortune and happiness. Although there is no happiness, there will be no disaster. Su Zhe was named "Zhe", hoping that he could avoid disaster.