When Quality Becomes Quantity — Goodhart's Law and the Metrics Trap. "When a measure becomes a target, it ceases to be a good measure."[1] This is the missing chapter of your Cucumber polemic. Coverage percentages, pass rates, defect counts — all of them degrade the moment they become OKRs. You already hint at this in Five Essential Lessons when you say "automation is a tool, not a goal"; Goodhart lets you prove it.

[1] https://en.wikipedia.org/wiki/Goodhart%27s_law