Although I'm a huge fan of hers, I have to admit that I see the flaws of her pianism. It is neither technique nor musicality, it's her annoying dilletantism. Too often, I have the impression her performances are nurtured with adrenaline rather than artistic emotions, her appropriation of the pieces is sometimes lacking. Like one day she wakes up, thinks about a random challenging piece and decides "Yeah, that one seems fun to play" and she goes for it but not enough in depth.
When she's forced to do things seriously on a concerto, a piano duo or a chamber music format, she does quite great, otherwise, a superstar like Hillary Hahn wouldn't pick her as a partner. When she's alone, she doesn't give a damn, but then on a given day, there is the random thundering, awesome execution of some piece(s) and I'm just like "Wow

".