In game development, extremely important. And to increase complexity, they can also “delay” state updates from the actual state to what is presented to the user

In game development, extremely important. And to increase complexity, they can also “delay” state updates from the actual state to what is presented to the user. The player's gold purse might already have that 10gp, but the gold counter at the top should only be updated when the gold icon completes it flight from the center of the screen. Also, this icon? It was originally rendered in the game layer underneath the ui, and has to change layers (which usually have very different layout algorithms) and un-chain itself from the camera movement during this animation, completely unnoticed by the player.