What I've read about her technique. She vehemently denies it is Russian School (and NO Hannon) and also not "the other one" (sorry I can't remember it's name. Her teachers tried to change her technique and she refused. At the highest level, it seems that everyone has their own "solution" which is complex based on physiology, genetics, and 100 other factors. I think she has the most graceful "hand art" of all playing. I love to watch her hands.
No soul? I disagree. She is not Lang Lang and she is not Horowitz. She plays with a naivete that I find endearing. But then, I'm a Philistine.
She has an "It" factor and I simply like to watch her perform - especially her hands of course. Martha, Zlata, Khatia, Yuja are obviously favorites of mine. Horowitz, Rubinstein, Cliburn are my guy core with a special note about Hamelin: he may well be the most advanced mentally and technically, but I believe he is living in higher dimension musically - just look at the insanely difficulty modern stuff he plays - it's mind boggling. Everything from Ragtime to well, you name it - if you can name it, he doesn't waste his time with it. If you've never heard it before and it gives you a migraine, yes he plays that stuff. And I'll never forgive him for that snide remark about pianists with small hands...
One other amazing factoid about practicing. Yuja Wang says once she learns a piece, she cannot "practice it" - the process damages the learned piece if you will. She said she is trying to figure out how to practice without the damage. (I suspect it interferes with her exceptional memory. Perhaps creating a litany of practice versions that simply confuse the learned version and use up memory resources.)