That would be just an excuse. Lore, Cutscenes, Quest all can be re-written to reflect the new changes. They want to make jobs more unique and with classes and cross class abilities that wont happen much. We really dont need cross classes. If they really wanted to give cure to X job they can just do it at a much later level than a WHM gets it and done. No need to pick from a list and no need to equip them anymore.