As a counterargument, drug-lords probably carry millions of dollars in cash across borders.
On the contrary there is a lot about security issue to consider when you are moving a big amount of money across the border. No one will be moving big amount of money without any security precautions and that would be alot of work to do however if you are to move your big amount of money in form of
BTC, you can do it alone with a single click and you can be sure that it will arrive at the recipient address ( unless you inputted a wrong address )
If you are intended to move $50,000 in form of
BTC in your wallet by carrying it across the borders , you can even do it secretly without anyone to know how much that you have and all you need for that is a simple phone to access your wallet and internet connection
All the comments here made somehow seem to assume that these features would be very attractive once the bitcoin is completely the dominant currency with max adoption.
Absolutely no,
BTC was created that way along with all the feature to disminish cash , to make FIAT looks like an ancient currency and even without mass adoption
BTC will always have the feature .