In the original novel, the main lead he goes back to his hometown and faces the consequences of the war and his difference in thinking and living, it would have added heavy gravitas to the movie. They didn't show it which is understandable considering they didn't show his home even before he joined the army but doing all that would have given the lead character a good arc. Since this movie is not following a band of soldiers and its trying to focus the story on single person, providing some foreground about his life before and during the war, would be just cherry on cake.