Which is exactly what happened in Sweden, according to the article.
Sweden made cash (practically) illegal so now everyone has one less choice.
They can't skim my cash, can't MITM my cash transactions, they can't accept payment and then not deliver (more fraud than theft, but still) because the cash and the object being purchased are both right there.
So I think you are wrong.
This would be abused in the US in very short order. How it works for the swedes should be interesting.
Not at all like cash, which just requires the entity to accept it as legal tender.
It is entirely possible to live your entire life, paying with only cash, in the United States. The hardest part would likely be paying rent, but even that isn't unheard up to pay with using cash.
Society is not cashless. The edge cases you are talking about rarely ever come up. If it is possible to only pay with cash, then the last hop is all that matters for you as an individual.