I actually put this idea to them back when the forum was a more civil place.
For the record, and from a personal viewpoint I agree with you. I agree it would be great and solve a hell of a lot of problems for the playerbase. But I think there are a few things holding it back, and probably even more that I am unaware of behind the scenes. For example, it would be more work. Each new update for the 3 platforms would need a PvE and also a PvP version of each patch. I am also led to believe that it also costs money to have updates certified by Microsoft and Sony. So I am guessing that would be double the costs in certification fees. Possibly longer development and testing times too. Although please do not hold me to these; they are more logical inferences that outright claims.
I guess the bottom line is that if they could wave the magic wand, great. I would welcome it. But it may be that it is just too difficult.