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Just because there are real world failures doesn't mean they didn't do simulations. It could just mean the simulation didn't account for something different in the real world.

The website for software engineers is assuming that a production failure means nobody did any testing before prod...

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So what you're saying is that something far worse happened here. They did test for flooded streets but some slight difference caused the model to fail in real life.

To be fair, there will always be something that fails. So the more important question is probably the frequency and severity of those failures.

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