While I'm not objective because I'm married to her, what I like about her interpretation of the C minor prelude is the variety of articulations and voicings in the mechanical section.
Well, I'm not married to her, so I'm a bit more objective and I would agree with you here

Thanks for posting! It's particularly interesting for me to watch, as I have been playing this prelude on a lot of pianos recently (including many Bösendorfers) in my search for a new grand. What I love about playing a piece like this on a top quality piano is the opportunity to really examine how the piano does or doesn't allow me to subtly vary articulation of each individual note. In other words, does the piano help me or hinder me when trying to make this very repetitive, almost monotonous piece come alive? (Not that my playing is anywhere near as subtle and detailed as this performance.) A Bösendorfer is a pleasure to play on every time.