Its not even 10% of what a runner can do, your point is void of reason. It's not about doing 100% of what i can do realistically. It's about being fluid and sub realistic in relation to the physical shape the character in game is. Are you telling me that in game that guy can't run up 1 hill without walking? A fat guy could do faster if there was a cheeseburger up there or a zombie chasing him. :P
It's about moving up a hill realistically and fluidly, not stop go stop go stop go here let me walk sideways so i can run. I've been playing since release, people who have been playing as long as me understand this bit.