Would you like to see “effective against armour” trait? Rather than completely ignoring armor, it’s simply ignores half the armor value of a unit when attacking it. Example, let’s say axeman has 8 attack vs swordman with 8 melee armor. Without the effective against armor trait it only do one damage, but with effective against armor it actually does four damage.
This can open the door for new regional units such as axeman, macemen, and various other armor piercing units. They could have trade-offs compared to the militia line. Less pierce armour, weakness to archer with them taking bonus damage, shock infantry class, all sorts of things. Slower train time. Unit cost.