[jimmySixDOF]

"You can't manage what you don't measure"

vs.

"Not everything that can be counted counts, and not everything that counts can be counted"

[lukevdp]

I think both statements are true.

[closeparen]

People manage things using their judgement and qualitative observations, all the time. We can accuse them of bias, but that has to be weighed against the fidelity of the metrics.