Archers dominate the game from feudal age to imperial age.
Especially in 1v1 game, archer is even more difficult to be fought against than knight.
The first reason is the unfair blacksmith technology.
Both Forging and Fletching cost 150 units resource. Forging can +1 AT for the melee units. However, Fletching not only +1 AT but also +1 range for range units. How it is so friendly to the archers. Infantries and cavalries must upgrade the LV2 armor, archers usually only upgrade the LV1 is enough.
The second reason is, if you have to defence from knights, you can just make many spearmen from Barracks without any blacksmith technology. However, if you have to defence from archer, first you have to build an archery range by 175 wood. After that, you must upgrade to Elite Skirmisher. Also, you have to upgrade at least Fletching, Bodkin arrow and Pedded Archer Armor. You may even have to upgrade Ballistics. Otherwise you can’t fight against archers effectively. You have to sacrifice a lot to defence from archers and follow the opponent’s rhythm. You have to make many range units to fight against the archers. But your civ may not be strong in archer so they may not able to become a reliable main force even you have upgrade many related technologies.
So, it may be a good idea to change Skirmisher to be an infantry and be created in Barracks and count as melee attack.
Skirmisher:
AT: 2 → 1
Range: 4 → 5
Attack bonus to archer: 3 → 4
Attack bonus to spearman: 3 (unchange, otherwise it would be very easy to kill them)
Elite Skirmisher:
AT: 3 → 1
Range: 5 → 7
Attack bonus to archer: 4 → 6
Attack bonus to spearman: 3 → 5
Attack bonus to cavalry archer: 2 → 4
Imperial Skirmisher (Become a common unit)
AT: 4 → 2
Range: 5 → 8
Attack bonus to archer: 5 → 7
Attack bonus to spearman: 3 → 5
Attack bonus to cavalry archer: 3 → 5
Also, +1 melee armor to Battering Ram, Mangonel and Scorpion so that they would not be destroyed by the new skirmisher so easily.
*The speed, attack, attack speed, HP, armor, cost bonus from Celts, Aztecs, Burmese, Japanese, Vikings, Teutons, Malian and Goths will just work on Militia line and their UUs but no longer work to spearman and the new skirmisher. And so Aztecs, Vikings and Malian can deserve Halberdier.
Please don’t feel odd this idea, the relics bonus in Lithuanians also just work to knight line and its UU, the cost reduce in Magyars also just work on the Scout cavalry line.