My concept for classes is that of the three disciplines (fighting, Force powers, skills) each class has one they're particularly good at, one they're a little less good at, and one they're bad at.
Primary discipline for Guardians is fighting, secondary one is Force powers, last one is skills.
Primary discipline for Consulars is Force powers, secondary one is skills, last one is fighting.
Primary discipline for Sentinels is skills, secondary one is fighting, last one is Force powers.
You must know that the point of ARCAGE is not so much to "improve" the game, but rather to change it - it is meant for people who have played the game more than once and who are looking for a new challenge. So whenever I had to decide whether I would do something this way or that way, I usually chose the option less like the original game.
You can read more about the philosophy behind this mod in the old WIP thread
. Many things have changed since then though, so don't take anything you read there for granted.