Because you'll trigger the people who wanted to play BLU, but in fact just wanted a BLM derivative called BLU with spells that just look and are named after enemy skills without any of the function (and good luck trying to justify a raiding BLU whose Bad Breath actually does what it does currently instead of being just another Bio), just so they can say "Look ma, I'm raiding/rouletting/AFKing as my fav job ".