A manager of people knows that in this stable state it is distracting to tell the worker about a mistake.
Management's job is to optimize the whole system.
People work in the system. Management creates the system
The aim should be to work on the method of management.
Learn the basics of analytics and people will love you. If you don't have time to learn, hire someone.
A system is a network of interdependent components that work together to try to accomplish the aim of the system. A system must have an aim. Without the aim, there is no system.