I was hoping that's how Jobs were going to be when they first came out, but I think that keeping the same level and doing quests in order to unlock the full potential of the Job is a way better route. Doing quests that explain the role/story behind the Advanced Job is way better than starting at lvl 1 and grinding IMO. Although I hope the upgrade to an advanced job is more immersive and story driven in ARR.
For instance, have a new story quest every couple levels that reward Traits as well as Skills.