ATT/BLA/BLA is a constellation of the Attacker, Blaster, Blaster roles.
In other words it's a predefined paradigm pattern. In battle paradigm allows you to be flexible and
change the way of how your characters are acting.
And buffs are effects which raise your attributes in a positive way.
Debuffs are the opposite and are affecting your enemies in order to weaken them.
If you never change your mind, why have one?