Would you apply the same criteria to code instead of file formats? As in "my customer has given me this code for architecture X and I need it working on architecture Y"?
For those who answer "yes" to the above I'd encourage them to read the story of the Therac-25 [1], a machine where hardware mechanisms in model A where replaced by software mechanisms in model B leading to a race condition that would dose patients with massive doses of radiation.
> Yes, there'll be mistakes.
"Over the following weeks the patient experienced paralysis of the left arm, nausea, vomiting, and ended up being hospitalized for radiation-induced myelitis of the spinal cord. His legs, mid-diaphragm and vocal cords ended up paralyzed. He also had recurrent herpes simplex skin infections. He died five months after the overdose." [1]
"But your honor, I specifically wrote 'add unit tests for important functionality'!"