Quote Originally Posted by rog View Post
When did that happen?
It's always been part of the definition of the job. Let me quote

http://wiki.ffxiclopedia.org/wiki/Red_Mage

"Their real strengths lie in their mastery of enhancing and enfeebling skills when within a party.."

That RDM is meant to be the game's premiere enhancing job is also evident in the fact that it has the highest enhancing magic skill, B+. White Mage only has C+.