Not agree with you on this point. Otherwise, let me ask you. When buying something and you pay with coins/banknotes, how are you protected? You can't go to the police and the bank and say my banknote has the number #xxxxx printed on it. As of today, it hasn't been a problem to spread this method of payment. Same thing when gold was used to trade
Come on you duffer OP is not asking for the number of banknotes paid and by the way how did it come to your mind to pay banknotes via visa card? To answer any of the topic it is must to understand it before passing comments.
Lemme explain it to the OP that in bitcoin we have a secure way to buy any services or goods. Escrow services are used for the purpose of security. Where escrow is selected by the mutual consent of both the parties I.e. buyers and seller. The buyer handover the amount to escrow and after the confirmation of buyer for the receiving of goods or services the escrow transfer the amount to seller's wallet. Escrow charge fee for his services just like a guarantor bank.