Map features by change frequency and failure cost; deep coverage where both are high, smoke coverage where both are low — uniform thoroughness is uniform waste.
Parallel execution, test-impact analysis (run what the change touches), and the pyramid discipline that keeps E2E thin — pipeline duration is a product metric.
Smoke on every commit (minutes), targeted regression on merge, full sweep nightly — fast feedback where developers live, thoroughness where time is cheap.
Refactor tests with the code, delete the obsolete, quarantine the flaky — suite health reviews keep regression an asset instead of a tax.
Skipping the discipline this article describes until an incident, audit, or stalled project forces it — every practice above is cheaper adopted early than retrofitted under pressure.
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