Well, I think there's a different between being weak and being primitive and being so freakin' stupid to keep pathetically dying for smashed brains the first seconds your people enters in combat and yet not develop a protection for it.
Legendary Leatherworker: "How is our Tribal Machetebold doing with my new dragonscale armor?"
Peasant: "Oh, he got smashed in the head because we are being kept from making armors that full cover ourselves."
Legendary pointless Leatherworker: "Oh, well, that kinda sucks. I hate when it happens."
Peasant: "Yeah, me too."
I'll make sure my Kobolds are master dodgers, then I'll see how long it takes to kill them. One thing is making fighting hard, another is making it pointless.