The arrogance of thinking you know EVERYTHING about a system so don't need physical tests to test if your simulation is real is quite astounding. I'm the product of a line of engineers so I know how they think but this astonishes even me.
But then I'm a Biologist, we do experiments that make engineers and physicists blanch with the degrees of freedom. Which is why we never approach the levels of Sigma physics can get to.
I remember describing to a physicist how we control experiments and he said the idea made him feel queazy.