Or it reflects that the two genres merged to a degree, because of a more nuanced understanding? Recent war movies like "Dunkirk" don't really show traditional h

Or it reflects that the two genres merged to a degree, because of a more nuanced understanding? Recent war movies like "Dunkirk" don't really show traditional heroism, they show a very bleak version of war, with the soldiers mostly surviving rather than fighting. "1917", while showing a heroic act of one (or two) main characters, also used imagery and portrayal of military and higher ranks that is essentially a reference to classical anti-war movies.