This, this, and even more, this.
Whatever your reservations about cryptocurrency, the technology does exist now that you can send the lion's share of your wealth overseas to a more stable country should your country become volatile and your currency crash. Just think about white South African Farmers and what a tool this is to them.
Admittedly, it's not everyday your government tries to confiscate currency or implement currency controls on your country, but there's a chance, and thus why cryptocurrencies play more of a role like insurance than it does speculation or commodities.
You don't need a lot. You just need some, much like I recommend every person should have 200 ounces of silver. The only problem is just what an infernal pain in the ass it is to buy and sell bitcoin or other cryptocurrencies.
Still, a lot less calories of energy than it would be if you had to rebuild your entire life time wealth.
On a related note - I also said this years ago, but went even further saying paying off debt should be a qualified "contribution" to your 401k or IRA.