Here is an interesting exchange between Arrau and Joseph Horowitz in the book Arrau on Music and Performance.
J H / Busoni and Carreño were the two pianists who influenced you most?
C A / Those two. Carreño more than d’Albert [one of Carreño's husbands], because he never practiced. He used to have a big technique. Then he started losing interest in piano playing in order to compose. And yet his performance of the Liszt sonata was still marvelous. Full of wrong notes, and missed passages. But the feeling was wonderful—coordinating the whole thing, with each idea coming out of the one before.