Earlier quoted context omitted.
As a retailer why would you accept payment in a currency with this sort of daily volatility of 10%, which doesn’t even have instant confirmation (!!??), has slow transactions, no rollback, no fraud detection or insurance and has high fees? As a customer why would you make payment in a currency with high fees, poor ux, slow transactions and just enough anonymity to make it perfect for scammers? As a payment processor…
Not that I don't agree with a lot of what you are saying, but I think despite being digital crypto is a lot more like cash than card payments. But cash also has 'no rollback, no fraud detection or insurance'. At least you are don't have the risk of counterfeit notes.
Physical currency was always an instrument of states, and now they have better ones, which retailers, consumers, and states prefer (digital currencies, not cryptocurrencies). In many countries cash usage is down to 20%, it's expensive to produce and manage and not required any more.