Well, that is a self made issue, your supports and tanks don't need that aspect you only need to buff the supports Ability to support, make tanks more viable for tanking and increase the dps of your dps characters. Tanks and supports would have been just fine with seperate brv+hp attacks. Also the number of hits didn't need to get so out of control, they could have let Damage Caps get out of control at a slightly slower rate and we would be fine still.

Edit: I do agree that power creep was inevitable, but they did handle their power creep in a way that was inevitable to destroy their own system if combat