I'm sorry but Im going to have to disagree here with this statement. You're blatantly ignoring the fact that the purpose behind Blue Mage is to break the game in unconventional ways. With MMOs, class balance is king and if Blue Mages are allowed to do current content then say sayonara to every single class in the game because they're all now pointless to play.

Blue Mage exists for people to have some fun with nonsensical balance and the only way this can be ethical in a sense in a live MMO is to only allow its use with previous older content.