It is very difficult to make a vigorous, plausible, and job-risking defense of an estimate that is derived by no quantitative method, supported by little data, and certified chiefly by the hunches of the managers. — Fred Brooks, “The Mythical Man-month”
No matter what the #Noestimates advocates claim, Making decisions in the presence of uncertainty mandates estimates. It's a violation of the principles of Microeconomics (decision making in the presence of scarce resources) tell you, it's ain't true.
