Partial Engine Reuse Masks Launch Fragility

Reusing a rocket booster while replacing its engines can produce the public appearance of reuse-led efficiency even though the mission still depends on new, single‑use (or replaced) components. That hybrid approach shifts where cost, cadence, and reliability risks actually sit—toward expensive engine production, inspection regimes, and insurance—rather than eliminating them. — This matters because commercial launch promises (monthly reuse cadence, cheaper rides for constellations) can be overstated if reuse depends on swapping critical components, which changes cost and schedule expectations for satellite operators, insurers, and regulators.