current state of the art is not very good, storing large amounts of cryptocurrencies is not as convenient as large amounts of fiat and it may never be as conven

current state of the art is not very good, storing large amounts of cryptocurrencies is not as convenient as large amounts of fiat and it may never be as convenient, but usability is slowly improving. Hardware wallets and safe deposit boxes and multisig let you build a system which is far better than storing your money in an unsecured bank and far less vulnerable to theft/loss than the mattress strategy.