Every metric can be gamed.
A web of metrics that cut across different dimensions are less easy to game than any one metric.
In an organization, it's tempting to find the one most important metric and then just focus entirely on optimizing it.
The metric-maximizing playbook.
This is dangerous!
If someone proposes metrics maximizing, instead of saying "Here's why that metric you proposed has problems"...
A "No, but" stance
And also, every metric has problems when optimized in isolation.
… say, "Yes, and we should add these orthogonal metrics, too."