I prefer paper money too (including Bitcoin). I like anonymity.

Every time you use a credit or debit card you're leaving a permanent record of who, when, where, what for, and how much. It's ironic that they call that a "paper trail". Cash transactions leave no such records.

Same goes for taxicabs versus Uber of Lyft. If I hail a cab on the street, specify a corner to be dropped off at and pay with cash, the driver doesn't know or care who I am or what my starting or destination addresses are. He's happy to get my fare and I'm happy to get where I'm going. In fact, he's probably happier to get his fare and tip in cash also, with less waiting and tax implications.

Cash rules.