Game devs have only so many hours in a week/month/year. If they're working on coding something, they must sacrifice time coding something else. That alone is argument enough against a lot of the "harmless" things these people insist on injecting into video games: For every "feature" added, there's one more game-breaking-bug not fixed, one more facial expression that is janky, one more "the train isn't actually a train, just a person with a giant train-like hat, hidden in the ground, because we didn't have time to make an actual train" incident.