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Many people also think that gold, bitcoin, money...everything will become useless if war breaks out, but I don't think so. I believe that even when there is war, the economy still works to some extent, I mean money is still used and people with more money will have better privileges and more life opportunities more. If you don't have money, gold, or bitcoin in hand, you won't be able to buy food or drinks, but if you have a lot of money in hand, I believe you can buy those things. As long as there is a need, someone will provide it for us, that's how this world operates whether there is war or not.
For me, it all comes down at the size of the war: if it's a "small" war like what is going on in Ukraine, and by small I mean that it's about only a few countries, than people can still go somewhere else and yes, of course any type of money would help a lot. If we are talking about a possible WWIII with all the countries launching nuclear attacks to each other then we must understand that life as we know it will be gone for centuries. In an hypothetical post-nuclear world water and food would be way more valuable than gold or cash.
I understand what you are saying and also imagine that if World War 3 breaks out, things will not be as simple as war between individual countries. But like I said, the economy will still function to some extent, as long as there is demand there will be someone to supply it. That is human nature and it will never go away even if we go back to the stone age after World War 3. Humanity has evolved over thousands of years by exchanging goods and it will always work regardless of world circumstances.
World War Three will be completely different from the previous two because technology has advanced and it will probably take us longer to rebuild, but I'm sure things continue to evolve. Our world will never stop for even a second, and to do that, owning assets is a top priority.