Light doesn't need selfish attackers, you are missing the point. Which is why I don't put chars such as Jeanne and Albert in my frontline unless the team I'm using demands so. What makes light relevant is the synergy between its characters, the possibility of having endless character combos (including retarded strategies such as putting SR Vermeil in the frontline with Ferry, or having SR Sophia + Vira and Nirvana to be invincible) AND having the most stupid debuff in the game.
As I always say, if you have enough chev swords you can hit hard with any character. It's a simple element that requires effort.
Light is far from a pure DMG element, but it brings more utility than any other element. I don't see you people discussing why other elements magna grids are so horrible.