What if Angry Birds kept their old level cleared/failed UI and the music a little longer?

In Angry Birds, I guess they should keep the old UI Level cleared/failed until V.3.1.2 and in Angry Birds Seasons, they should keep it until V.4.0.0. So that we can see what happens if we used power-ups while the Angry Birds and Angry Birds Seasons still used their old UI Level cleared/failed screens.