I am in awe of people who live on a cash only basis. There are a number of members of DA who do this and, in fact, I think most people in program did so before the advent of debit cards.
I am eternally grateful for debit cards and YNAB, as I am one of the many who find that cash mysteriously disappears, something like one of a pair of socks when you remove them from the dryer.
If I had my way, I would never use cash at all! It literally seems to burn a hole in my pocket. I know others as well who, when reconciling their numbers, inevitably find that their cash is off by a few cents to a few dollars, or more!
Some people have a category called “Lost & Found Money,” which they use to replace money that disappears. I currently have $16.85 in my Lost and Found category. And there have actually been times that I had more cash that I thought.