I think what the OP is trying to say is that he wants a little more variety to his playstyle. Unlike WoW we don't have talent trees. Every job is highly specalized, you have one or two skill rotations and you have ONE thing to do and a big part the game is all about mastering that singular task. Job crystals are supposed to be like specs, like with arcanist can decide to roll DPS or heals depending on their job crystal. As for when other classes get multiple jobs, its anybody's guess