Depends on what your goal is and how your body responds, my biceps & traps don't really respond to the less is more approach, I've tried it and it didn't work. Once I started going with overkill that's when I got the results I wanted.
yeah, I kind of agree on this. The biceps particularly are muscles that can be trained mostly through curling and nothing else else (I personally don't know of any other motion besides curling that actives the bicep on isiolation)
wann use the EZ bar? you'll curl. the preacher? yes, to curl too,
Dumbells? Barbells? Cables? yes, to curl as well.
So if one has a dedicated day for arms, curling in its many variations is almost a certainity.