I like to think of myself as a cynical and poisonous individual. I wouldn't have the slightest hesitation putting the boot in if I thought otherwise, but I must say I think that the Duchess of Cambridge nails this.
I am frankly unconcerned about how technically easy or difficult the piece is, what impresses me is her time keeping. It is absolutely nailed on. There's not a drummer, a click track or a conductor and she starts solo. Take it from me - someone who failed at this for years - when you practice alone steady tempo is your Achilles heel playing with others.