Quote Originally Posted by AlphaDragoon View Post
As Noctis said, that would undermine the point of adding Jobs, which is to make you good in a party setting at the cost of flexibility.

Basically, because SE is using the "change classes at any time" route on this game like Phantasy Star Universe/Phantasy Star Online 2, they wanted to still have a way to make "defined" roles without forcing you to stay as one class the whole game, as in games like Aion/Tera/etc. So they did this.
re-read what you wrote...we're not forced to stay as one class...we can switch and change any time we want...we can define the classes as we need...