That's true, to a certain degree. DOM might cover the object placement, the scene graph and perhaps collision detection. On the other hand, I'm pretty sure DOM

That's true, to a certain degree. DOM might cover the object placement, the scene graph and perhaps collision detection. On the other hand, I'm pretty sure DOM doesn't provide a boilerplate game loop. It might sound trivial, but sorting and linked lists also sound trivial and you don't see people reinventing them on a daily basis either.