A rule should suit the purpose.
A leader knows who is outside of the system and needs special help.
Change the rule and you will get a new number.
It's management's job to know.
The average American worker has fifty interruptions a day, of which seventy percent have nothing to do with work.
One cannot be successful on visible figures alone ... the most important figures that one needs for management are unknown or unknowable, but successful management must nevertheless take account of them.