Simply put, Skyburner's Oath cannot trigger Ignitions easily as it should be, sporting around an entire magazine to ignite one enemy with Ember of Ashes. When compared to other Exotics that essentially build up to an explosion, this is a very slow option for something that isn't inherently powerful; Polaris Lance can get off a couple of Perfect Fifth Shots in the time it takes to get a single ignition, Malfeasance can get a bunch of Explosive Shadow hits to activate, and Ticuu's Divination needs to be shot twice to do 1-3 explosions, that vary in damage and circumstances. Make Skyburners Trigger an Ignition every 7-10 direct hits would put it at a good pace with similar weapons.