This is how the Technologies window looks now. City and Temple infrastructure were joined together, while their tax bonus revenue was slightly lowered. Shipbuilding is now an Economy Tech. The Military technologies were changed so now Infantry and Cavalry tech increase morale (up to 40%) and defense (up to 60%) of Infantry and Cavalry units, respectively. On the other hand, Skirmish and Melee technologies affect the Attack value of troops (up to 60%) and decrease the probability of using generic bad tactics. Finally, Military Organization now gives only a low overall bonus to morale (up to 20%) but keeps its importance for Retinue Size, and we added now also Reorganization speed (morale recovery) of armies.
Light Infantry and Elephants, being neither skirmish nor melee specialized troops, do not increase Attack damage. Light infantry base values were bumped a bit to compensate for this. This means that Light Infantry and Elephants will have a bigger impact with low technology, losing a bit of their edge as technology advances. But Light Infantry will also be more relevant in difficult terrain (see below).
Historical Setup of Tech Levels
We also changed the initial values of technologies a little, to be more historically asymmetrical. In the picture above you can see the Constantinople values at game start. As an advanced society, Constantinople can build more advanced buildings, and has increased Military Organization and Legalism. But the Frankish lands will have some superiority in Melee and Cavalry. The Frank/Norman Knights were a fearsome sight on the Battlefield.
The combat tactics interplay can give a bonus of up to 900% to some troop types while making others non-attackers. To make terrain, especially difficult terrain like Mountains, more relevant for a battle, the defender bonus was increased for most infantry types, especially for light infantry (see the picture below).
Narrow Flank is a feature of a battle where the number of enemy troops that can attack is limited by the number of troops on the flank the gets the bonus. We changed Narrow Flank to both become more probable in difficult terrain and be modified in a more consistent way if you have a leader with the Battlefield Terrain Master trait. The effect of Narrow Flank was also extended to the skirmish phase, to have a larger impact in a battle.
We hope that these changes will give you players more control over the battle conditions and thus increase the influence your decisions have over the battle outcome. Together with the tech rebalance, we hope these changes will improve the CK2 experience for both new and experienced players.
Finally, as stated before, these numbers are not final, and if you feel strongly about something, let us know.