The important irrefutable feature of hot wallets is their ease of configuration and use. In contrast to cold wallets that are operable in the offline space, hot wallets are available exclusively for online use. So most people, for comparison purposes, use mobile hot wallets to trade or buy cryptos. It would be bothersome to do this with a cold wallet. You'd need to locate equipment (generally a laptop), something that you can connect to the cold wallet to make transfers. In case that is a single payment, you may send the crypto directly where needed; if not - it would take sending the amount of digital money to the hot wallet first to complete the payment.