Imagine a hospital pharmacy during a ransomware attack: card readers frozen, offline modes not configured, and patients with only phones turned away. My opponent's M-Pesa example is real, and inclusion gains matter, but it runs on a telecom grid, not on air. Redundant networks and offline card modes are still digital and still need power, configuration, and trust. Cash is the only bearer asset that settles without permission or connectivity. The other side lists cash's failures, robbery and tax evasion, but those are policing problems, not reasons to eliminate the fallback. Efficiency is the objective. Resilience is the constraint.