The problem with metals, besides that I can't buy a jug of milk with it, is that tyrannical states can and will just take it. Metals are for the rebuilding phase, not the purge phase. And bitcoin is for getting a safe distance while it all blows over.
Get off the drugs. It's far easier for the state to make Bitcoin unusable than metals. And confiscating metals is even less feasible than confiscating guns. Even Shlomo Nakamoto says Bitcoin is useless vs state actors.
Because it's so useful if the G7 or G20 banned Bitcoin but someone in North Korea has a 486 with the magical ledger of imaginary, valueless tokens on it! The state can easily destroy and prevent the use of Bitcoin because running a police state in the digital world is cheap and cost effective (see Facebook, Twitter, the nation of China) while running a police state in the physical world requires orders of magnitude more resources. Pretending it's harder to stop Bitcoin than metals is a flat out lie. They require the govt's own infrastructure to even work at all.
Martin Armstrong has been talking for years about people getting harassed for transporting precious metals across international borders, or having the PMs confiscated.
PMs are almost completely useless, aside from international settlements and reserve holdings.
Edit: Open your eyes - we're not heading toward a more open world. Governments around the world are starving for money, and putting tighter restrictions on moving money internationally.
I used to always have a 1oz gold eagle in my pocket. Out for a bite ... off to work ... air travel, whatever. I gave up the practice some years ago.
In theory, should not be a problem. US CBP does not admit to caring about anything under $10,000. Would take a rather large-ish silver coin to get to that limit. Then again, why tempt fate?