Why the Singular Framing Fails
This is not a minor correction. It changes what someone is actually looking for when they try to identify their own contribution.
Someone searching for a single defining achievement will often come up empty — even after a career full of real impact — because the achievement they are picturing was never the actual unit of value. The unit of value was the discernment behind dozens of achievements, refined through repetition until it became reliable. That discernment does not show up on a résumé as a single line. It shows up across every line.