This. After the first few battles it was trival to equip our armies to have an advantage against the Zonasians. I also note that while your realm noticed that Arcaea tend to opt for a more even troop distribution rather then having a few rich nobles with large units and everyone else with very modest units, it never seemed like you were able to replicate it Arcaea SHOULD be an easy realm to counter, as we rely so heavily on infantry, I worry about the day someone on FEI puts together a force tailored to take us on.
This is very true. We tried, but many nobles simply weren't active or didn't want to. We had gold we were willing to throw around to any noble who wanted to march north... Anyway, Zonasa is working on expelling the idle players from the realm (as some are probably spies and others are just jerks who want to be difficult, i.e. sit in the capital and send the money to their families to be used elsewhere). Erandi is cracking down on region lords to get their knights into shape. They've got an oath of service, after all, and if they're not providing the service that the lord demands, well, they're in breach of oath and can go find somewhere else to sit around all day.
Also, I think a 'catch infils' option might be good for police work. As now we simply patrol the streets, that's dependent on nobles actually doing some infil work. Whereas the forward scouts Arcaea had in Zonasa almost effectively couldn't be caught (scouting regions to see when Zonasa was leaving, once the armies left they were pretty much free to cause problems). This is probably where Erandi's hatred of infiltrators hurts Zonasa, as the Principality really doesn't have an elite infil who would counter the other. Maybe this problem will be somewhat handled by the new diplomacy when it goes live...