You are not the one to tell me what I should want and be happy about, sorry.
People have been saying that Blizzard are not going to give to Alliance a fair skin elf because it would blur faction identity. These people were wrong, evidently. And Allied Race system was specifically made so that Blizzard would be able to add different version of existing playable races in fashion that requires little effort and be lore-friendly. It does necessitate that only one another version of a playable race can be introduced. Still doesn't.