[contextfree]

Fair enough. My guess is that the apps that don't support it are mostly games, which generally use a different framework that doesn't bake in this or any other interface conventions. But I can see how any amount of inconsistency could prevent a feeling of confidence. I guess to me the fact that these games tend not to look or feel anything like other apps is enough to keep their behavior from polluting my subconscious mental model of expected behavior in general.