I was working in a grocery store (after the turn of the millenium) when the CC processing went down. We could accept debit or cash, but no Mastercard, Visa, or AmEx. I didn't get (or don't recall) the backstory, but I wouldn't call Canada an under-developed nation.

Cash makes my budgeting easier too. I find it harder to overspend cash I don't have on my person. The cost is more tangible (as every debit/credit tap "feels" like the same amount). Consumers have been shown to spend more when using electronic payment methods too. As to the coins, those get tossed in a jar to be rolled later, then eventually taken to the bank and to a rainy day fund.

Cash is fuckin' excellent.