Malignant Rings - Do i have to understand?

Do I need to understand why 3 out of 5 classes get a ring that can be used in various builds and the Barb is the only one besides the Necro that is limited to certain spells? The ring buffs the strongest builds even more and something like Double Swing is left out in the cold. Why not include all of the barbarian’s core skills so that more builds can use the ring?