The vast majority of games are geared towards a kind of narrative finality that requires a very definite resolution. There's a structure of objective-completion-reward that necessitates closure: you have a task, you complete the task, and you get the reward. It's a closed process. Games with open endings, however, challenge this structure. An unresolved narrative contrasts with a completable, objective-based game. As a result, there's a dissonance inherent in games with open endings, a tension between the lack of closure on the one hand, and the traditional objective-completion-reward structure of video games on the other.