VividSloth

I recently picked up the Cities of Sigmar army and realised that they dont have any named characters. I have noticed a lot of other factions have named characters that are crazy powerful and that just doesnt exist in Cities of Sigmar. Is this on purpose? Is there a feature the Cities of Sigmar has that makes it so they would be too powerful if they had named characters? Or is it that Games Workshop just hasnt released those models yet and if so when will they?