A: XI had a release stigma that impeeded the red mage for the duration of the game, the same sort of stigma that paladins and shaman suffered in vanilla WoW. Though in an odd compliment to WoW, their community got over that stigma, you clearly have not.
B: XI's vision of classes was heavily influenced by the community, such as ninja tanks. Not to mention that XI butchered the red mage more thoroughly than XIV just recently butchered the Dark Knight.
C: This is an entirely new FF game with its own spin on classes (evidenced by the butchering of the Dark Knight, Bard and Summoner), the red mage could end up fighting in melee using a rapier in one hand and a magitek shotgun / pistol in the other (shoots magic damage based bullets) and as long as they call that a red mage, it is a red mage.
