The diagnostician
What else could it be?
The obvious answer is often the wrong one. Crift works the differential (the alternatives you'd forget to consider) and drives toward the cause beneath the symptom, not just the symptom itself.
Technological Sociological
Symptom → differential → root cause.
What it surfaces
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The cause you'd have ruled out too early.
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The second condition hiding behind the obvious one.
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Why it failed, not merely that it did.
Each candidate is weighed against the evidence for and against it, so ruling something out is a decision you can show, not a hunch.