Warframe has you grind for power.
Not to retain the use of powers you’ve already acquired.
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Very true. I'd say that, aside from random rolls and power level, in Destiny there is very little difference between a green 450 RPM Auto Rifle and a purple 450 Auto Rifle. In Warframe, if you compare an early game rifle, the Braton, to a late game rifle, the Opticor, they have almost no similarities, other than they use the same ammo type.