To quote from Nope: "He got caught up trying to tame a predator. You can't do that. You got to enter an agreement with one." Grimm have been shown, for the most part, to be feral animals that prey on humans. Currently to me, Salem feels more like a leader in the sense that she climbed up the ranks in whatever societal thing the Grimm have.

I agree on the point that they should have more random combat skills since a majority of them are feral creatures. Feral creatures don't play by whatever rules there are, if they want you dead, they will kill you.

One thing I don't agree on is the "Dust Resistance" thing. I get where you're coming from, but at some point that would become "Dust Immunity" and Dust would ultimately be useless against Grimm.