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I think the most notable thing that comes out of it is: Fish in a stable tank with good husbandry will be resistant of disease. I think this holds true regardless of QT.
That is a sweeping generalization, lumping all "disease" into one category. Most healthy humans handle a cold virus just fine, but would be in a world of trouble if exposed to Malaria, Tuberculosis, Ebola, H5N1, meningitis, etc. Without prompt medical treatment.
The same can be said of ich & gram-positive bacterial infections (relatively mild) vs. velvet, brook, uronema, gram-negative bacterial infections (usually fatal without treatment).