Why does Baidu Encyclopedia introduce Mongolian cavalry with the phrase "This Mongolian cavalry has got rid of the shackles of traditional European military thinking"?

Mongolian cavalry's style of play is to kill the enemy with light armour and long-range archery, and try not to confront the enemy head-on. When the enemy comes after me, I will run, and when I run away, I will shoot again until the enemy's formation front is dragged down, and then concentrate the superior forces to carry out counter-charge. On the one hand, the light cavalry can't be compared with European knights in armor; on the other hand, the heavy knights in Europe can't be compared with Mongolian light cavalry in speed and endurance. At that time, the military thought in Europe was to stick to the fortress, and the frontal conflicts were all carried out in the form of decisive battles.