Burnwinter I think it depends. Underlying metrics are often used as a validation that the plan/system are working. And sometimes that's right, you need to stick with it to bear fruit.
The risk though is if it's a validation that flies in the face of increasing evidence that we just haven't got what we need to win games (eg. More ways to score goals).
So yeah, I can appreciate it has its place but I start to get concerned when it gets trotted out on a day too consistent basis (which Wenger was guilty of I think).
