Are modern Mongols good at fighting?

Neither ancient nor modern Mongolians are good at fighting. The ancient Mongols conquered many places. This is a military operation, not a battle. I've never heard of anyone traveling around the world by fighting.

As for not seeing Mongols at the battle meeting, maybe you didn't notice. You can go to Inner Mongolia, Xinjiang or Mongolia to see the Nadam convention and you will know that their wrestling is very good. There are many Mongolian players in Sanda and boxing competitions in China, and they have achieved very good results, such as Baoligao and Alimusi recently. In this year's Olympic Games, Mongolian boxing also won a gold medal.

The population of Mongolia is relatively small, accounting for less than 0.4% of the population of China. So you think they're not there.