Now it is possible to drag several warriors from the very beginning, who by the modern era will gain 250-300 experience and become the invincible backbone of the army, because. AI is not able to destroy such strong units or will not attack them, because these units have maximum damage resistance.
In general, the basis of the game is the competition of empires, their production facilities and armies must be regularly updated by rotating units, where dead units are replaced by new units trained in Barracks, Armory, Military Academy.
Why not add to the technologies that open these same Barracks. Armory, Military Academy modifier on the maximum possible experience for units? Those. at the beginning of the game, units will be limited to experience, conditionally, 90. Opening Barracks will increase this bar by +15, etc. The same goes for policies and ideologies.
In general, the basis of the game is the competition of empires, their production facilities and armies must be regularly updated by rotating units, where dead units are replaced by new units trained in Barracks, Armory, Military Academy.
Why not add to the technologies that open these same Barracks. Armory, Military Academy modifier on the maximum possible experience for units? Those. at the beginning of the game, units will be limited to experience, conditionally, 90. Opening Barracks will increase this bar by +15, etc. The same goes for policies and ideologies.