Q: Some Addons are so powerful they simplified the game content to a degree (e.g., boss fights). Do you think that when the majority are using these Addons, the original reasoning behind the game design is violated? And isn't it unfair for players who don't use Addons?
A: This really deserves a long answer. It sounds like a good topic for a future developer blog. To tide you over until then, we can say that some addons do a great job of providing information we really should be providing (and have long-term plans to provide).This includes information like threat, the distance you are from other players , when you have a killer debuff on you and things like that. On the other hand, when addons are too helpful, they are playing the game for you and you're just doing what the addon tells you to do. When the mod tells you so much information about the fight that you don't even really need to pay attention to what is happening in the world at all, then we feel that crosses the line. I don't know that we could put the djinn back in the bottle at this point though. It would feel really harsh to prevent addons from tracking some of that information, and in some cases we're not even sure how we would prevent it.
We continue to try and come up with new mechanics that ask players to pay attention to the fight itself instead of just pushing whatever button the addon tells them to push. You might be alerted to when Atramedes emits a Sonar Pulse, but you don't know where it is going to be. Sinestra's Twilight Slicer requires you to look at the battle field and not just your UI. To be fair, we are also trying to do a better job of telegraphing to players when bosses will use predictable abilities. The Conclave of Wind and Nefarian for example do their special abilities at predictable intervals along their resource or health bar.
It is a fine line to decide when an addon becomes mandatory. Ideally you could raid without any addons, and some players do. Information is often power in complex raid encounters though, and we agree that in some cases we don't provide enough information yet. Does that mean Blizzard needs to replicate some of the screenshots produced by players who install thirty mods and completely overhaul their UI? Probably not. Our raid UI is a good example of what we are going for. It provides enough information for many players (and we have plans to add more to it overtime). It's not going to incorporate the favorite feature of every raider out there, and for them, a very customizable third-party addon is a perfectly reasonable solution.