Quote Originally Posted by MizoreShirayuki View Post
Why should anyone go PGL when they can go MNK? Why should anyone go GLA PLD when there's GLA?
It's quite simple actually. Being FFXIV's Armory System, the Jobs depend on the Classes. If you are powerful with a Job it's because its class is helping you support its power.
Classes here are the base requirement for a Job. This can lead to many things, like unlocking different Jobs by raising the level of certain classes and have more specializations
A Monk is not a Pugilist, as a Pugilist is something you use for solo, being able to select actions from other classes and be auto-sufficient. In a party a Monk makes a huge difference; different stats and Job actions are something that make the Monk a great element for the party.

Classes are the basics. Jobs are the advanced, specialization of classes. I know it's hard for who lived with FFXI all this time, but remember it's a different game =)