Quote Originally Posted by Stepjam View Post
Because PvP is much more twitchy while PvE is slower and more deliberate. The PvP changes were made to help that aspect, but they aren't gonna give that concession for standard content. Nor should they, the classes are already simple enough.
The developers said that the PvP combo system was implemented in that content to allow players to focus on the strategies of PvP environments rather than on a rotation.