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This article challenges the conventional wisdom that engineering productivity comes from maximum utilization, arguing instead that maintaining intentional spare capacity enables engineers to capture high-impact opportunities that drive outsized business value. Software engineers' greatest contributions often come from being available to handle time-sensitive events—major contracts, incident mitigation, critical features—which requires protecting 20% of capacity rather than constant full utilization. By preserving this slack and avoiding low-value work, engineers can recover from stress, maintain composure during crises, generate creative insights, and contribute more meaningfully to their organizations.