The ENTIRE POINT of the Job system as it is is that you can have one character and level/use all of the jobs/classes in the game on that one character. You can progress as a WHM, switch to a WAR and progress...and so on.

So when they put in something like this attribute system and have it be class based, but there are two jobs with opposing stat needs on that one class, it then makes it cumbersome to switch between the two if you want to be effective at them. So most people choose one and don't play the other. Right now that's only one job you have to go without (SMN or SCH) but it's still for a really stupid reason. And this'll only get worse as they add more classes and jobs and we have to make more choices. This will lead to having to have 2 or more characters on a server just so you can play as all the different jobs in the game. It's a cumbersome system for no benefit.