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Ambushing is usually the moment where the DF annihilates players. This would not be an issue if aiming with it was so easy. It does enough damage to kill even Heavy with few shots, so ambushing Pyro can kill even Soldier without him being able to react
Airblasting penalty or secondary delay won't come to play because of reasons I just showed, and really are not a proper drawback imo
DF projectile is different from old flames, so I don't think we can compare them (even new flames are broken since you don't need to track properly in order to do good damage)