Originally Posted by
Malamasala
In most cases it is not about what you can do, but what you want to do. Take PLD for example that indeed CAN main heal, but it will be rare to see them do so. BLU can also main heal... you won't see that happen often.
Almost all jobs pick one role they want, then claim everything else is "wrong". PLDs can heal, SMNs can melee. You just won't find many that will accept the truth. It is more convenient to pretend the job only has ONE way to be played. For one thing, it lets you mock others who stray from the path.