"A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die and a new generation grows up that is familiar with it." — Max Planck; https://en.wikipedia.org/wiki/Planck%27s_principle
Does this really happens? During the lifespan of a scientist living in the 20th century, several scientific revolutions happened, maybe even simultaneously.
Whereas if you live say thousand of years ago, basically nothing happened ever.