I'm usually not one to make statements like this, but I think it applies in this case. To all you who do not want add-ons, the answer is simple. Don't install them. The whole idea behind the idea of an add-on is to give the user the freedom to choose to use, or not to use them. I think an add-on to allow people to personalize their UI could be useful. As is obvious here, people have different preferences. Why funnel them all into the same cookie-cutter UI? On the same vein, some people like knowing how well they are performing in a pure numbers aspect. Why not let them have something that shows them the numbers in real-time? It gives them no advantage in game, and doesn't hurt other players, so where's the harm?