I am pretty sure Buffet gives exactly zero fucks about “missing” crypto. Whenever I go to the store, I have never bought Bitcoin. But I have bought a Coca Cola. When I drive a car, I have never needed Bitcoin, but I have needed car insurance. Pretty sure that Berkshire has some idea about what they’re doing.
Crypto currencies might have some uses, but it’s pretty much a fad. Blockchain is interesting, but Bitcoin is pretty useless. I have yet to see a single thing that BTC does that I can’t do with actual money. And ICOs? Just ridiculous. Solutions in search of a problem.