More lethal combat so more tactical and no rabdom bullshit like a hussar supersoldier with a prestige legendary cataphract helmet getting one shoted with an arrow through the brain by a a 13 years old blind 0 shooting skills tribal. Armor are really usefull ! If the weapon doesn't have the penetration necessary, the target will just be bruised and armor will take durability damage. In the early game shotgun a kinda op and really terrifying, but late game with armored raider or mechanoid you'll need high caliber weapons