“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.”

Isaac Newton

It's a kind of fear of missing out. If you spend all your time becoming keeping up with one tiny field, there'll be so much else that you know nothing about at all.