So, your wounded in the battle do you really think you can still swing that hunk of metal with the same gusto as before? Probably not.....so, random thought. Why not have weapon damage(maybe even swing speed) be linked to your health, damage outputed is reduced the more damage you take.
Now some of you will say, why dont we just ex off agi players all together. Well, normally as an agi player your gonna die in one hit anyway. So, why not make it that the enemies your fighting be effected by those little bits of health you keep taking away. It would also make peasants in their support roles more effective by diminishing combat effectivess of higher level characters.
Anyway, food for thought.