That's a new one. Genuine question, why do you prefer using cash instead of using a phone or card?
I do this especially when it’s dark outside and I have to go out to shop, this way, I don’t lose anything significant if I get robbed.
Another good reason is that some shops have to pay a fee for being able to accept digital transactions, for some shops, the fee is quite a lot. So paying with cash is preferred and helps them a bit.
Lastly, while it sounds shady, being able to pay in cash keeps me from being traced by the government. I don’t really have anything to hide but having the option to be anonymous If I want feels good.
If I have to buy larger amount of groceries, then I wait until daylight. No way I’m carrying more money when it’s dark outside.
You don't need it all the time, just for emergencies.