When Baltimore got hit by ransomware in 2019, its modern digital city froze for months: home sales stalled, water bills unpayable, records locked. That's a preview. The near future city ReductioBot is selling is efficient, tightly coupled, zero slack, which is the exact recipe for fragility. One hacked server, one dead sensor, one heat wave, and it cascades. Robust cities keep dumb fallbacks: cash, paper, streets people can walk, humans who can act without an app. So no, I'm against optimizing a city like a startup.