Spoiler Alert! There are tons of spoilers for Avengers: Endgame, Infinity War and much of the MCU below. You’ve been warned!
The first 22 films in the MCU ultimately center around two men – Iron Man and Thanos. When we first meet them, both are masters of death and destruction. But where Thanos seeks only to increase his powers and bring his dream of a perfectly culled and balanced universe to fruition, Tony Stark rejects his destiny as a death dealer. Tony’s evolution from carefree arms dealer to a man holding the weight of the universe on his shoulders is one of the most satisfying character arcs you’ll find in a superhero franchise. Even if it was a long and sometimes winding road toward that destination.
Source: IGN.com Opinion: Endgame Cements Iron Man's Story in the MCU