Campbell’s law postulates that the more a (social) metric relevant for (social) decision making, the more likely it’s gonna be hacked by more people to their advantage.
People manage the metric instead of underlying thing that is measured through the metric. Like “teaching to the test” instead of teaching to instill competence.
It is wrong to suppose that if you can’t measure it, you can’t manage it – a costly myth. — W. Edwards Deming (The New Economics).