If Tech is understandable by anyone, it should be understandable by BRK, yeah?
If Tech is where the returns are today, that's the game you have to play. Especially if you believe the "second half of the chessboard" argument.
'It's hard' isn't really a reason to avoid investing. Actually, the more difficult it is should only advantage BRK.
They may give up the more sizeable advantage they have over others in spotting durable competitive advantage in other-than-Tech, but so?
They should still maintain an advantage in strategizing (index vs basket), timing (market cycle, valuation), position sizing, etc.