There's a ramen shop in Seattle that won't accept cash anymore, and that always leaves me feeling uncomfortable. What's wrong with real money? Why should we all

There's a ramen shop in Seattle that won't accept cash anymore, and that always leaves me feeling uncomfortable. What's wrong with real money? Why should we all be dependent on banks to mediate our transactions? I haven't stopped going to that ramen shop, and I often pay for things with a debit card anyway, but it feels wrong not to have the option to use cash.