Overall, Mongol infantry need to be nerfed and cavalry need to be buffed. I refuse to play this civ until my glorious Mongols are represented properly in game. No self-respecting Khan faffs about with infantry armies.
- Yam network only applies to cavalry. This is historical (it was a messenger network relying on horsemen, after all), resolves one of the common complaints about Mongol power, and will naturally cause Mongol players to focus more on cavalry.
- Cheaper cavalry, more expensive infantry. 10-20% in both directions would be fitting. Infantry, for Mongols, should mostly be siege support. You train them if you want to build or defend siege weapons in the field, but not otherwise. This is historical, and makes the civilization more unique within AoEIV.
- Replace foot archers with a new unique Mongolian mounted archer, existing alongside the Mangudai. Same damage and range as regular foot archers, but cost and HP closer to light cav. They do not fire while moving. It’s criminal that Rus have the most common horse archer builds, and that the only Mongol horse archer is a little-used unit that only exists to raid. On that note, if Mongols get a generic horse archer unit, it should have the generic name, and the Rus unit should be renamed - perhaps to Cossack? These were the Rus who adopted steppe tactics, after all, and they began appearing in the (late) medieval period.
- A buff to Mangudai. Have Siha Bow Limbs give Mangudai half of the anti-heavy bonus damage enjoyed by crossbows. Proper eastern composite bows (especially those with siha limbs) shot harder than the average Western crossbow, and this gives Mangudai a proper role on the battlefield into the late game. It will not be OP - their short range and poor armor still make them vulnerable to archers.
- Slower cavalry, by 10-20%. Yes, I want nerfs as well as buffs, if it contributes to the identity of the civilization. Mongol horses have more endurance, but less potential for top speed than other breeds. Game-wise, this will help balance out their oppressive cavalry focus, and make the Yam network more central for cavalry builds.
When I play Mongols, I want to be managing a mounted horde. Unless I am going for a very particular strategy, my go-to unit in any scenario should be mounted. If you disagree with my specific suggestions, please provide your own. If you disagree with my fundamental argument, know that the blue sky looks on you with shame.