Bitcoin is the safest haven currency because it is absolutely yours. You own it. Nobody else has access and power over it except yourself. And when a world war breaks out, your fiat is going to be intercepted at the airport. There's only a maximum allowed. Your gold and silver and other jewelries have to be registered and taxed as well, and there's probably another maximum value. Your Bitcoins, however, are unknown to whoever is screening your belongings.
When Bitcoin works the way it's intended, sure. The only problem I see is that majority of people don't even know how to use Bitcoin properly. I'm not even talking about so complicated measures like manually doing CPFP or whatever, I'm even just talking about reviving a wallet from private keys.
You can talk about the benefits of using different values based on the conditions in which we live. But we must really look not only for today, but also at what may be in the future. If we say that we should not focus only on investments in Bitcoin, but choose at least 15 or 20 different cryptocurrencies in our portfolio in order not only to get better results, but also to minimize our risks, then we should also focus not only on cryptocurrency, but also make investments in real values in order to avoid all sorts of bad situations.