Speaking of contactless payments on the phone, can someone explain to me why people use this? Literally, why do you need it? Is it because you have accounts for

Speaking of contactless payments on the phone, can someone explain to me why people use this? Literally, why do you need it? Is it because you have accounts for which you don't have a card? If an account has a card, a card is a superior technology to make payments - doesn't run out of battery, the phone does. Or is it because you think that carrying a card with you is a logistical challenge? Or something else?