This is the revised translation of my article published in "ITWeek" magazine January 24, 2019.
An expert tries to know more and more about less and less until he knows absolutely everything about nothing. And a philosopher tries to know less and less about more and more until he knows nothing about everything.
Daniil Granin, "Going Inside a Storm"
Some citations (I completely agree according to my experience).
Everything will look fine until you suddenly discover that the next user story conflicts with previously implemented ones, and you have to go back and rethink everything