Tech simply has a proven track record of raking in outsize profits, and I see no reason to bet against businesses with unmatched efficiencies of scale and enormous barriers to entry. Hell, even the king of investing, Warren Buffet, has been humbled by BRK only just keeping up with SP500 because of its huge 25% investment in Apple.
You would have to go out to VT - total world market to see a difference in portfolio allocation.