I had no idea the Lumia clock screen did that, it's a simple but brilliant solution to mitigate the problem. I'd love to see more work go into subtly shifting persistent UI elements around to avoid the issue. In particular I'd like to see the navigation keys and status bar on Android adopt something like that. I wonder if the UI elements would even need to shift locations or if it would be enough to shift colors so it isn't one particular color that degrades unevenly.