Since the thread title is rather general, I hope I may piggyback on this thread.

I would like to suggest a tweak to the recruitment of Scythians in regional MICs. This almost exclusively affects Hayasdan, in practice. They can get Scythian horse-archers in the basic regional MIC, and riders (archers with some melee ability due to the lance) at level 2. My suggestion is that these two units be bumped up a MIC level, so Scythian recruitment would be foot archers at MIC-1, horse archers at MIC-2, and riders at MIC-3.

Reasons:
1. Easy access to horse archers makes Hayasdan campaigns easier than they would be otherwise. A handful of horse-archer units do wonders for squishing rebel stacks or the typical Seleucid mini-stacks invading your land.
2. Since Scythians are so easy to get, both Armenian Skirmisher Cavalry and Armenian Horse Archers are useless units. Javelin cavalry is far worse than horse archers, and the Armenian HA require a factional MIC-3 and cost more than the Scythians but have identical stats. If the Scythians took an extra MIC level to acquire, the jav cav becomes a plausible option for the early game*, and the Armenian HA might well be available in Armavir before Scythians can be recruited in Kotais or Mtmumble.

* = tangential suggestion: switch the starting unit of Aspet Hetselazor for a unit of Armenian Skirmisher Cavalry. That assures that the latter unit will see play, and since early game Hayasdan relies heavily on the bodyguards the loss of a unit of medium cavalry is not very significant.