Considering the Mongols in new DLC don't have to worry about China at all, it does seem like the game isn't as fun or challenging it could be until they add China in AUH.
The main thing is Chinese dynasty intercede and interfere in nomadic politics a lot.
After Temujin/Ghengis Khan lost a major battle, from what we can guess he escaped to Jin Dynasty China and became a subject of Jin dynasty for almost 10 years.
en.m.wikipedia.org
This dynamic really isn't present in Khans of the Steppes. Yes you can become an adventurer...but how much Chinese dynasties tried to balance and make alliance between different tribes and rulers really needs to be a huge deal.
Hopefully AUH will add more Chinese-mechanics with the nomadic governments.