Not to mention peoples money would smell like their beds. I prefer using safes for quick access things and deep unmarked holes for longer term storage. One of my methods is to pay extra for services so that I keep a credit on each account such as internet, power, etc... I also keep about 100 gallons of fuel with fuel stabilizer and SeaFoam.
I believe the logic is that if one has enough cash on-hand and their bank gets into trouble, they can still pay for food, fuel and other basic things to get by. It probably won't help for paying large bills like rent and mortgage unless people risk keeping a lot more cash on-hand. One can go into their brick and mortar bank to pay cash for their mortgage. It's good to do this periodically to pay extra towards the principal and shorten the loan duration.