I know. I'm not arguing that the hordes are weak. Northern frontier tribes really could use a general buff.
In my opinion, Ming shouldn't be nerfed, but the northern tribes need to be buffed in order to pose a larger challenge to Ming, as they always were.
- Jianzhou is the most powerful Jurchen tribe. It cannot be paralleled by Haixi and especially Yeren, yet they are exposed very early by Korea. AI Korea never hesitates to declare, and Jianzhou, the first, the last, and the only hope of Manchu, gets forever lost to the ever steady Korea. Buff Jianzhou so they are not the easy insta-target for Korea.
- Mongolians could also get some buffs as well. They defeated a 200 000 strong Ming expedition with as much as 20 000 men (they didn't engage with the entire manpower in a single battle, though) in 1449. I know the game cannot replicate these kinds of events, and the hordes already have some powerful military bonuses, but Mongolian tribes could also get some love. Buff Mongolia and the Four Oirats.
- Other tributaries are fine as they are IMO. Ayutthaya is especially underrated.
My main concern, however, is this: With the next expansion being focused at army professionalism, and Ming being one of the few nations that can always keep maintenance up, they will end up having some of the best troops, while the tribes, who are reliant on low maintenance during peace time, won't match their armies in quality. I sincerely hope there is something i am missing, but the whole army drilling and professionalism thing is quite scary to me.
Ming is also the nation that just lose all its manpower to attrition and end up spamming mercs. So their professionalism will stay at zero. And army drilling doesn't buff mercs.