In Final Fantasy XIV Armory is the way how the classes are handled. Unlike other MMORPG games, the system used in Final Fantasy 14 is a bit differently where you can choose a class and live with it or you can select skills and then level up your skills to the max. These classes are archetypal and you are not stuck into one of those.

I have played many MMORPG games. One common problem that I, and I am sure many other players, used to have is we like trying out different classes and skills but we always had to rebuild a character to try different builds or class. Final Fantasy XIV has an advantage with this respect. Instead of creating new character, if you want to check out new class then you can simply swap your weapons.

FFXIV armory system uses class structure of any standard RPG games but at the same time also gives you an opportunity to explore new classes. Along with solving the traditional problem, it can also be fun when you are given an option to change to whatever you want whenever you want. For example, if you are getting bored playing a wizard. All you have to do is take out your sword and start whacking. You don't even need to find a tank or header like you have to do in other MMORPG games. When you play WOW or games alike, we have to sit or look for hours to find a tank or header. Here you don't have to do that. You can take up this position yourself and get into action!

To summarize, the way in which you can change your class in Final Fantasy XIV is an excellent system in this game. It helps to ensure that things don't get boring and also reduces chances of people having bias towards any classes there by creating a balance in the game.