Humanities DNA holds all collective genetic information of our common ancestors. That specific DNA is waiting to be activated by those with the courage to do so by their actions, used as an example in the movie by the Dauntless faction. No special traits are needed to excel in the practice of honesty, selflessness, bravery, or intelligence. Neither are written tests, physical initiations, or divided factions are needed for the actual world to succeed. In the world, every day is initiation, and the testing is ongoing to help someone choose their career path. Every person will be defined by their beliefs and selflessness, Abnegation, their thoughts and intelligence, Erudite, their words and honesty, Candor, and their actions and bravery, Dauntless.
