Frankly, if they wanted better performance, they should streamline the DD jobs so they aren't overly complicated and introduce more content that requires actively coordinating with other players to the leveling experience. Furthermore, they should be removing DD checks so people have time to type during combat. Players who are dealing with ten minute long fights should have plenty of opportunities to communicate, instead of assuming they rely on VOIP that may or may not be available. If they don't support addons, then they should design the game to be playable without VOIP.