I have been saying for over a decade now that coaches have no balls and don't go for it on fourth down nearly as much as they should. Within field goal range at the end of the half may be different, but it makes no sense to me that just giving the ball to the other team if you don't get the first down on the first 75% of your set of downs is the widely accepted thing to do. The only reason coaches punt, unless their defense is way better than their offense, is because punting is never considered as a reason for why they lose games (because that's just the normal thing to do for some reason), but if they go for it on fourth down and they don't win, then it becomes an issue, and obviously they don't want to get fired.
Suppose punting wasn't normal and everyone went for it on fourth down. Imagine how stupid you would sound if you were the one who decided, "You know what, we give up on this drive and we're just going to kick the ball over to the other team now." By punting instead of going for it on fourth down, you decrease the amount of plays you have to get the ten yards by 25%, which is a pretty big deal. I know it sounds crazy because it is just different from how we are taught to understand football, but
Kevin Kelley gets it, and even NFL teams are starting to consider his aggressive philosophy.