But in brief: You estimate because estimates help you think through the problem, they help you set goals, they help the team make choices about how to spend their time, and they are a powerful tool for managing the scope of projects.
Yes, Virginia, You Can Estimate That
Camille Fournier

YES! My explanation to engineers who are desparate to get back to their text editors: the value of estimating is not the number you get out at the end — it’s the work you do to get to that number.

The time spent digging around in code, forcing scoping or architecture discussions to happen, or uncovering assumptions that could cause pain mid-sprint, is invaluable.

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