Galileo Galilei, Letter to the Grand Duchess Christina of Tuscany (1615)
.... Considering the force exerted by logical deductions, they may ascertain that it is not in the power of the professors of demonstrative sciences to change their opinions at will and apply themselves first to one side and then to the other.
There is a great difference between commanding a mathematician or a philosopher and influencing a lawyer or a merchant, for demonstrated conclusions about things in nature or in the heavens cannot be changed with the same facility as opinions about what is or is not lawful in a contract, bargain, or bill of exchange.
If those suggesting we abandon the principles of Microeconomics of Software Development (decision making in the presence of scarcity, abundance, and economic value)†, requiring that decisions made today with their impacts on future outcomes, do so without probabilistic knowledge of those impacts can be done in the absence of estimating those impacts - think again.
It Just Ain't So
† Software Project Effort Estimation: Foundations and Best Practice Guidelines for Success, May 7, 2014 by Adam Trendowicz and Ross Jeffery
