There is actually nothing wrong with metrics if used moderately just like there is nothing wrong with eating pizza once in a while. But UPS is using metrics much like the obese man who attacks the local pizza buffet. Both are slowly but surely killing themselves.
The progression is simple and inevitable. In layman's terms it is known as a "negative feedback loop."
New technology has given UPS the ability to measure an ever-increasing number of job elements.
Once a job element can be
measured, it will be
managed.
Once that job element starts being
managed, it will be
micro-managed.
An ever-increasing level of
micro-management will inevitably lead to a
loss in efficiency, which will trigger the development of even
newer technology that can measure even
more job elements, in a process which will continue
ad infinitum.