It was dealing way too much damage. As long as you are caught in the initial blast, you have like only 2 seconds to get out of the aoe or else you'll be dead. Even just by running through the affected area, the linger damage will bring your guardian's health to critical, that's how much damage it generates compare to Hunter or Titan's nade.
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But Titan's blinds you and Hunter's sets you on fire. They all had their advantages
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No argument on titan's but hunters incendiary nade does toooooo little damage over time.