Since Radiant is a non-stacking damage buff that is on par with Ward of Dawn and Well of Radiance why bother using either of these two supers? A single hunter with Acrobats dodge and Ember of Torches is capable of applying radiant to an entire fireteam for a prolonged amount of time while being able to run a high damage super. Additionally, radiant allows you to move around without losing the damage buff.
So if a fireteam is planning on running a maximum of a 25% damage buff, why use Ward of Dawn or Well of Radiance when you can use Radiant?
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Survivability. Those supers do more than just provide a damage buff.