Though Apple has been Berkshire Hathaway's (BRK.A 0.95%) (BRK.B 1.11%) top holding for several years, Warren Buffett has historically avoided tech stocks.The renowned value investor has said that he can't forecast earnings for tech companies as they are less predictable, due in part to the changeable nature of technology, than other sectors. Buffett has historically preferred to invest in sectors like insurance, banking, utilities, energy, and consumer staples that have predictable cash flows, and whose ind ...