I don't really see the need for this. We're not exactly competing to finish the story first or something. We're not competing with each other in order to get the best gear. Even now, with PVP, gear will be essentially worthless. As far as PVP is concerned, it's generally an everybody wins type of game, and there's no major incentive to be on the top. Competitive gameplay exists as a very small minority of content within the game, and changes to such small pieces of a game don't warrant investment into a test server of some kind.

I think it's plain to see that everyone is merely concerned with the overall state of balance between classes, but there is no real reason to fix issues that may arise a week or so in advance to an official patch, which is all the more reason not to actually invest money into such an effort.