Weird logic right there buddy. Could turn that around jsut as easily - why should you be rewarded for afking at range with your melee build?
Fact of the matter is these two auras provide increadibly oppresive conditions without any max range. If I have frost aura on me and I stpe into a lingering effec ton the ground, whoever put that effect there will get chilled even across the map.
It silly to argue that there shouldnt be a max range on these effects