Was the fighting capacity of Manchu cavalry really strong in the late Ming and early Qing Dynasties?

At that time, the elite of Manchu Eight Banners were all cavalry, which was the most powerful cavalry regiment in the world at that time, and there was basically no dispute in the history circle;

At that time, the strongest combat capability of the Ming army was the heavily armored Ning Guan fighters. This army can kill all the rebels in the Central Plains, including Li Zicheng, but it still can't be compared with the Eight Banners in the field, and it relies more on solid fortifications.

Another point can also explain the fighting capacity of the Eight Banners in Manchu Dynasty, that is, Manchuria conquered Mongolia and made an alliance with it. We should know that Mongolia could not be completely wiped out in the Ming Dynasty for hundreds of years, so it can be seen that the fighting capacity of Mongolian cavalry is quite objective, and it was completely defeated by flag soldiers in decades, which shows that the Eight Banners cavalry is quite powerful.