The reason why is originally, if you read my post in the announcements forum, is that people cried afoul because of the 2 fairies and the 4 plants. ...
Does the same line of thinking work for you in the opposite direction, where this change was initially brought on via crying so a guild could retain...
By that logic, it should have never been changed from being separate in the first place... because there were progression-kill based decisions before...