I can hand my friend cash at the dinner table. And that's what I do. No central authority needs to be involved in things like this, nor should that be required.
Yes, you can do that. And no one is proposing to change it.
You can also get mugged in the parking lot by the waiter or accomplices once he sees your wad of cash. Carrying cash is risky and cumbersome. This is why banks exist.
Those who don't want to carry cash will now have the new found ability to pay anyone instantly without it.
