The anthology format requires tropes and cliches in the characters. But to give an example of an espisode that aged well,”Two” with just Charles Bronson and Elizabeth Montgomery would feel like an anti-nuke war episode in the early ‘60s, now it looks like a traditional romance where a real man finds common cause with a real woman scared and forced by war to be an enemy. That episode would not be done today.
King said that ending was already a sci-fi chiche in pulp magazines long before The Twilight Zone ever did it.