Forgot to add... They want to be able to make anyone unable to buy anything at the click of a button. Sweden is pretty much there already so now we are hoping the government doesn't turn into fascism because then we are completely unable to do anything. Keep your guns, America.
Handling cash is expensive for stores. They need to store the cash safely in-store, deploys all kinds of security measures to prevent robberies and theft, use armored cars to transport to and from the bank, pay more in insurance, etc.
GDPR and other laws are supposed to stop that, and has worked out nicely according to audits. Stores are not allowed to keep your credit card number just a reference number. (But a lot of clubs are now registered on the credit card so they can still conncet a sale to a person with out storing the credit card number.)