Come to think of it, there are so many advantages of having a crypto wallet versus a physical wallet. You can carry your crypto wallet anywhere as long as you have your phone with you and you will be able to use your funds there just the same way you do with the physical wallet carrying cash on it. If you carry more than $10k at the airport, you have to declare it with customs. You don't have to do that with a crypto wallet.
The wallet of coins cannot be confiscated by a court for debts, alimony, etc. The law has a blind spot here.
Can you add some more please?
The difference between your regular cash and credit card (or debit) and crypto wallet is that you can't cash out the crypto one as easy as you might think. For example if you go to another country you can have 9999 dollars (or even just 9k so you won't be a prick) and you won't declare it but you can have your debit card in your wallet which can carry as much dollars as you want without declaring it. You can cash out the money you have and that way you can just spend that anywhere you go.
However if you have crypto you need to go to another country and find a way to cash out bitcoin there as well, since you do not speak their language or know where the crypto exchange is you will have to log into one of the localbitcoin accounts and find someone you never met before from another country to do this. Its a lot easier to carry your own wallet and do old fashioned way for now. It will be easier in the future for sure but not for now.