[guscost]

There's risk that any of those metrics could be compromised by Goodhart's law: "When a measure becomes a target, it ceases to be a good measure."

Obvious counterpoint: Money is also a metric susceptible to Goodhart's law. Is it better or worse if the metric is useless except as a target?

[WorldMaker]

Another counterpart is that not everything can be made a metric no matter how hard you try. The advertising world has duped us into believing that we can make metrics out of exceedingly subjective things like "satisfaction" and "happiness", but just because you ask a dozen people to pick a random number between 0 and 5 on any subject you think you can come up with doesn't mean that a 3.76 average means anything at all in the real world.