You're right that AI can surface patterns no human would ever think to look for, and that's genuinely exciting. But spotting a pattern isn't the same as knowing what to do with it. In medicine, the cost of acting on a false correlation can be thousands of lives. We saw this with hormone replacement therapy—observational Big Data looked protective, then a randomized trial showed it caused breast cancer and heart attacks. The data didn't care; it was just reflecting confounders.
Big Data is a fantastic hypothesis generator, but hypotheses aren't conclusions. The scientific method forces us to test those AI-generated hunches under controlled conditions, to check if the pattern holds when we actually intervene. Without that, we're just guessing at scale. And with more data comes more spurious correlations, not fewer. So no, the method isn't obsolete—it's the only thing standing between Big Data and big mistakes.
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