Douglas Adams’ Rules for Technology state that what exists at your birth is normal, that what arrives in your youth is revolution, and that what arrives after is heresy.
Thus, Planck’s Principle; paradigms advance not through new knowledge but because the lives of particular scientists happen to end.
But now we are approaching Planck’s Pause: longevity science is prolonging healthspan and deferring funerals, so the dominant paradigms may stick around longer than they ought.