Wearing heavy armors can be useful to absorb most of the damage taken by weapons. Also, some armors are more useful against certain types of damage, so using weapon who can pierce or crush the opponents armor is a good idea.As you can see, two Royal Guards are beating each other during the War of the Two Sisters, while the Night Guard seems to be more smart since he is aiming directly to the opponent’s head, who uses a hammer that woul pobably crush or even pierce his armor with ease.Hits to the head are an optional rule, who are made as sostitution to a Critical Hit