Counting accepted Copilot suggestions to prove AI works is like counting keystrokes to prove the team can write.

It is the cleanest number on the dashboard. It is also the one that tells you nothing.

Forty years ago Fred Brooks split software work into two parts. The accidental: syntax, boilerplate, scaffolding. The essential: what to build, why, for whom, what to trade off.

The accidental is what AI tools are good at. That is why the dashboards look spectacular. Lines generated. Suggestions accepted. Prompts sent. The tools were always going to win that part.

The numbers that should actually move sit one layer deeper. Cycle time. Change failure rate. Time to first PR review. Defect density.

These were already telling you whether the team was shipping good software, long before AI showed up. AI either bends them or i ...