Both Unity and Unreal Engine (UE4) supports Metal, so any games created in Unity/UE4 for Mac & iOS might possibly use it. If the game doesn't need anything beyo

Both Unity and Unreal Engine (UE4) supports Metal, so any games created in Unity/UE4 for Mac & iOS might possibly use it. If the game doesn't need anything beyond GL 3 support then the creator might choose to not enable Metal and stick with GL. I don't know what percentage of Unity/UE4 Mac & iOS games have Metal enabled, but it is potentially a very large number. That's the thing about Metal -- as long as common libraries and game engines add support for it, most developers won't have to do much additional work to use it. Only people who are writing their own graphics engine from scratch would need to learn it.