OP you are wrong.
Here's a good example, the arrow keys on a controller are used for several commands because of its lack of buttons which hinders game play. When I am in battle and hit the up and down arrows on my keyboard all the only thing that should happen is changing the selected ability bar 1-3, however this isn't the only thing the arrow keys do. All too often I will be fighting something and want to change my ability bar from 1 to 2 and instead all of a sudden I just targeted something else, because the arrow keys also change target, so now I am dead because I couldn't get to my cure quick enough WHY IS THIS???
How the controller works. This is exactly what happens.
DPAD changes targeting type [ ENEMY PARTY FRIENDLY ]
Press A Once, a circle should appear around the target. The color of the circle relates to the color of the target type.
Enemy RED Party Blue Friendly yellow/gold
Press left or right on the dpad to then cycle through targets.
Press A again to set that target.
Your action bar now appears you can now use left and right to cycle through your action bars choose a spell or attack.