Indeed, I'd rather also see the attacks being kept to the class.
Btw, here is an idea that was extesnively discussed, and at one point it seemed Craig has agreed to implement it: for Malis to be a well-rounded Shadowling Assassin, equip her with Feedback as well, since this is one of the attacks that Darkling can learn too, and he was an assassin. Otehrwise, although fast, Malis would be difficult to use in later stages of the game, whilst Feedback will make her more of a stand-alone, but not tank-type unit (and be able to finish off difficult enemies without getting killed herself).