Unfortunately, I think it runs in contrast of what the game is and what the player’s role is in the game.
You are trying to navigate the world that is there, and new systems should make that world more immersive and intriguing. Making your culture wouldn’t be immersive at all, it would just be power gamey nonsense. You wouldn’t have a unique style, players would just take whatever options give you the most powerful stuff. It what I’m saying isn’t what you would do, they you’re already a player that is fine using armies of nothing but Sturgian or Aserai troops and you aren’t too concerned with this feature. Instead you find a mod that deepens the playable troop roster deeply