1. Please get rid of the feeling that "biggest army wins." History is full of fantastic upsets and the game would feel far more meaningful if there was more RNG in the outcome of a battle. As it stands now, if I have 20pct more boots on the ground with levies I expect to win, and I nearly always will.
2. Please fix the Byzantine retinue. It is currently useless due to the bad tactics for Horse Archers.
3. Please make Knights more powerful and impactful. They are currently rather lackluster due to poor retinue combinations and mediocre tactics. This can be done by changing the Knight retinue to all Heavy Cavalry. This will also be fun because Knights are cool. Id like to see the presence of Heavy Cavalry being more impactful to battles via tactics.
4. Please fix how technology spreads to islands.
I love CK2. Keep up the great work! But please see point number 1!