Not everything is spelled out completely. Making breath weapons deal bludgeoning doesn't accomplish anything that removing immunities doesn't do better.Derren said:That is not the case. The breath of a dragon is more damaging than a campfire because it is hotter, not because there is more force behind it (otherwise it would deal bludgeoning damage).
The firehose harms a person because of pressure, not because the water is more watery.
Who hasn't seen a picture of a dragon blowing up a building or a fireball blasting a door off its hinges?