Why does the "stick" used in martial arts keep hitting?

Long sticks are generally made of gray sticks or rattan sticks, which have good toughness and elasticity. Especially when using chopping, collapsing and shaking techniques in war, even if the opponent has a time frame, it is still possible to be effectively attacked because of the elasticity of the stick. Moreover, a long stick with good elasticity is beneficial to the development of some moves in traditional stick techniques. Although there are a few metal sticks on the market, only beginners will be interested in them if they think they are hard and strong, and people who really practice martial arts sticks will not like that.