Because he never revealed his success technique so following his geberic ideas will not make us a warren buffet but what we have to do is just take him as an example,he believed and invested that is why he is more successful than others.
He was the most successful investor, don't forget about that. He's an old man now, 88 years old, and his brain is unable to process all that new information from the past 10 years. He said it himself, in one interview I watched, that he's relying on the opinions of his advisors regarding Bitcoin and blockchain technologies because they are younger and better oriented in the subject. Thus we can't know what that Warren Buffett, 20-30 years ago, would say about investing in BTC, for instance.