FFXI was for the majority of its players the first MMO they had ever played, sucked in to try them by the FF7-FF8 games. As such they didn't come in with all the terminology and knowledge from other MMOs. FFXIV is different, all the players it has have played MMOs before and the huge pulling games like 7-8 don't exist for the new generation.

As such this game is filled with MMO players, many from XI (that played wow too). You just won't re-create FFXI, its ideals or community on any other game, that's why everyone uses these terms.