Manual storage also makes it security and convenience, you can that hot wallets can be connected to the internet through your computer or phone, while cold wallets are hardware devices to larger investments offline for offline.
But a recent Trezor malware hack proved this to no longer be the case. Many will end up with several versions of each: an exchange account hot wallet, a mobile hot wallet, and a hardware cold wallet. The user transfers funds to the associated address and safely puts away the paper wallet until a future date when they choose to move the assets.
