Yes thf/nin is, so the grand meaning on this thread is too keep mages with mages subs and melee with melee sub. This is because of a balance in the world of FF11. the closest you'll get to a multi task is smn/rdm which I am leveling now. It includes all summons (only if you got them), some white and black magic. not at all am I saying its better, I'm just saying you get three types of magic. With ninja you will find you can solo a lot of quests and or missions due to some of its spells. Anyways be cautious of /smn /drg /bst because your pet will only be half of what you are and thats not good it you want to rely on them.