In the unlikely senario you need to run to another country, you would need to carry it. If that’s the case, you can carry gold. Of course, it and the gold can be takin at gunpoint. With a hot wallet, all you need is the clothes on your back and the 12 words and borrow a computer. If eleven of the words are in a email, you only need to remember one word.
You cannot travel with more than $10K in cash without catching the eye of the Feds. Good luck carrying gold, even a handful of Kruger rands will set off the metal detectors and you will miss your flight while having to explain to some Fed rep how and why you have that much gold in your possession.
I have personal experience with this, first leaving South Africa in 1990 when full on foreign exchange controls were in effect. You could not just cash your accounts and leave, even if you wanted to. Similar restrictions are pretty common as countries slip into 3rd world cultures. I would have said this would be impossible in the US, but honestly with us slipping more to socialism and big brother, I would not rule it out.
I also have had direct experience with this in the US, ironically bringing money in, rather than taking money out. Imagine arriving in Miami with several tens of thousands of dollars in cash direct from the Caribbean. Yup, that took some explaining, and was only handled because my boss at the time was extremely well connected to several senators.
I think this is partially what scares the .gov, you could have millions of crypto on a USB drive and travel anywhere in the world, and they have virtually zero control.
There was a full time business in South Africa related to defeating currency controls, and most were successful, but you were definitely treading in grey area's if not full on illegal - go direct to jail, if you were caught. Gold only works for amounts less than $100K, and even then you are risking it being confiscated if found and you cannot explain. Now if you were leaving on a yacht, like we did, there was definitely opportunity, or as a number of folks I know, left with uncut diamonds - but unless you knew the business you were risking your life savings or more
Heck, I am about to move the very last of our investments out of South Africa in the next six months, and I will be using Crypto on various drives to accomplish that. This will become increasingly difficult especially in 1st world countries as they figure out ways to control the sheep.