He sold high-flying Apple stock instead, but why?Legendary investor Warren Buffett has made some surprising moves during his tenure at Berkshire Hathaway (BRK.A 0.42%) (BRK.B 0.38%).One of these moves was buying Apple (AAPL 0.27%) stock in 2016, despite famously avoiding technology stocks because he considered them outside his area of expertise. Another was selling a big chunk of his Apple holdings this year, despite its market-crushing returns.Even as he was selling a big chunk of his big winner Apple, Buf ...