I think in FF1 DoS Fighter got nerfed some, he's noticably weaker offensively than Thief and Black Belt. In prior incarnations, he rivalled Black Belt and surpassed Thief. Red Mage also got nerfed when Int became a factor in spell potency. Either that Black and White mages got a buff - take it as you will, there's now a large discrepency in potency. Thief got buffed so much he's almost a new character entirely. I can't say I mind having a character with a hit count that rivals a monk and damage that surpasses the warrior. In my Warrior, Thief, Monk, White Mage party, my Monk was always top DD.