One of Bitcoin's advantages is the ability to "move" large sums across borders without worrying about border guards seizing it and calling you a smuggler or money launderer.

When moving cash above a certain amount you're supposed to do paperwork informing the border guards. Not so with BTC because you only move you, not your money...you just sell for local currency upon arrival. Even if the border guards don't seize your money there's nothing stopping a crooked one from phoning a buddy and tipping them off to follow and rob you later.