How does what I suggested uniquely benefit gangs? As opposed to, say, just weakening the damage modifier of a/s/b across the board?

It was in response to Malakhi's assertion that a/s/b mages are "insanely powerful". I was trying to come up with a way to make them less "insanely powerful" and yet still able to compete with top-tier single opponents (e.g. RBWs).