Having only one subclass that can escape duskfield is better than now subclass like hunters.
As for your argument about ice flare bolts being situational, you can literally make the same case for most abilities. The melee maybe slow, but it does have some light tracking with a 3 meter aoe.
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Don't hunters get out of duskfields easily because of their high mobility?
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No, mobility affects class the same. Icarus dash can escape duskfield as well as behemoth melee. Titans can also slide through with out slowing.