I'm fairly sure a dev or in a live letter long before quoted it was likely going to be DEX based. For anyone to be surprised now, doesn't really pay attention. I long felt it would be DEX based because I felt they had said so already. Of course people were fast to assume, "I hit with weapons, I must be STR based.". They also use something akin to Magic, that makes perfect sense to use on an STR stat for that.