I would suggest you listen to her studio Gaspard de la Nuit (my favorite gaspard, but perhaps I am biased?) as opposed to her live which goes like a bat out of hell. I would be very suprised if you found the musicality unnatural or forced.
I agree. I like Michelangeli's almost as much, but the Argerich studio recording of Gaspard from about 1975 (Deutsche Grammaphone) is still my favorite and one of the great recordings of all time.
I understand the criticisms some have of her, but to me she gets exactly the effect she wants, has total control, is more likely to look at the big picture than the details, has passion up the you-know-what...and well, it almost being Valentine's Day and all, she has my heart

But seriously, back to the original question, pianists like Argerich, Cziffra, and Horowitz transcend their technique. Horowitz was the most telling case, because he often played show-stopping, technique-busting pieces as encores (Mozkowski, et al.), and he played them with all the bravura they deserve. But in the rest of his playing, the music rules and has obvious priority over showing off at the keyboard.
We have some pianists today whose technique is flawless, and whose phrasing and musicality is likewise flawless -- it sounds almost like it is all learned and none of it is from the heart or soul. I'm thinking now of Marc-Andre Hamelin and, to a lesser extent, Yundi Li. I think Yundi is just young and will mature into a fine interpreter. Hamelin has had time to grow, but I still find his playing almost artificial...perfect but somehow not quite human. I marvel at his technique; I admire how much expression he brings to these hugely difficult pieces. But it all leaves me cold, like it was performed by a computer program. I don't think there's anything wrong with this type of pianism, it's just not my favorite kind of pianism.
Oh, now I'm going to get it from the Hamelin fans!!!
