The proposal makes sense, but only because with the first wave of jobs we are limited by one class to one job. After a couple more base classes are added for requirement combinations, we'll soon have (for entirely hypothetical example) Lancer splitting into Dragoon, Templar, and Dragonkin. At that point, people can enjoy casual messing-around activity as the base classes with free-er choice of abilities to set, and switch up to the defined roles when things get serious and Meteor's knocking at the door.