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Divisibility:
The money material should be capable of division; and the aggregate value of the mass after division should be almost exactly the same as before. If we use diamond as money and by chance it drops from our hand and breaks, we will suffer an enormous loss. This is not the case with precious metals. Their portions can be melted and remelted together any number of times without much loss.
BTC folks ignore this very important quality of money. On the scale of world commerce once a wholly insignificant number of people start to spend their BTC a few times they find themselves eaten up by multiple $50+ fees.
Digital gold is simply a failed meme. Usable money beats store of value in everyday life and most definitely when shtf.