The evolution of ideas and ways is seldom a gradual curve.
Long flat periods of understanding become the simple “this is how it is done” mentality of the day. Time passes, things change incrementally and very slowly. Than an outsider floats into view doing it their way, trying it differently, toward a new outcome. The outcome eventually resonates with the audience, a new bar is set and the game is officially changed, the reigns adjusted and evolution jumps up a notch.