I'd really love to see weapon and shields breaking in combat. I understand this would put a lot of resources into such a program but it brings a new reality when in the battles.
When a pila hits a shield, it should break or at least disarm the shield. When an enemy attacks your sword and you parry, that sword should have a chance of breaking. When an axe hits a spear, that spear should be cut in half. When a charging horse with a spear attacks someone with a large shield, that spear should break, etc.
I'd really love to see this in game. Although theirs a 99% chance it WONT be in game, I'd love to see some modders do this in the future.