Every sprint spent hardening the wrong idea compounds sunk costs and makes reversal politically painful. We quantify engineering hours, marketing spend, and morale debt, showing how a single decisive pre‑sale or waitlist conversion could have redirected effort months earlier, saving real runway.
Opinions energize brainstorms, yet customers decide outcomes. Replace internal certainty with field evidence: real traffic, credible copy, meaningful asks, and measured responses. When a cold audience parts with email addresses or deposits, you gain the only vote that matters and lose comforting speculation.
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