Rewards card (card or apple pay through phone) for almost everything.

You introduced me to square cash.

Checks are still required in some weird places (DMV) but I don't write them often.

It's funny you mention this - my wife just had me pull a couple hundred bucks of cash out of the bank to have at home for miscellaneous purposes like paying kids for babysitting/odd jobs and for things like graduation/wedding gifts. It's just nice to have some scratch laying around.

I have a brother-in-law and a father-in-law (on different sides of the family) who both use almost exclusively cash. In fact, my father-in-law pays me in cash to make online purchases for him. He's kind of a conspiracy/tinfoil hat kind of guy when it comes to identity theft and "the system of banking lies on wall street". whatever... but it's weird because he ALWAYS has like 3-5k in cash stored in his car somewhere... He bought a car from me last year and handed me $9000 in cash - and I don't think he had to stop by the bank to pay me... There were some OLD bills in there.

My brother-in-law uses cash only because he lives in a small town and that's just how he rolls. It's all about cash, old school tabs, and a handshake. and he's loaded. He only pulls out the Marriott card when he's paying for a $75,000 concrete job on his next commercial building. He's a baller that way.

Lastly - I've got some friends who own a few bars and other businesses. Cash allows them to pay themselves off the record. They draw regular "pay checks" from the businesses - but just enough. So cash money is how they roll most days - lunch, drinks, etc - it's all cash. They end up having problems trying to spend the "unaccounted for" cash.