With Wu Jinliang's current High Martial cultivation, he could produce the same effect by punching the cliff wall. However, if he were to use a blade, the force exerted would be too unilateral to cause such widespread destruction, unless there was something wrong with the stones themselves.
But there was no problem with the hardness of the stones here; he had personally dug a cave in this place before.
Moreover, whether wielding a blade or a sword, it was better for the cutting power to be more concentrated. If the power were to disperse as it had just done, it would defeat the purpose of using these weapons.
But he had just blocked a blade strike and clearly felt the power behind Shi Chun's slash. There was no indication of power dispersal that would have reduced its strength; instead, the attack seemed to grow even stronger, and the opponent had mentioned he had only used thirty percent of his strength.