Sure. If both parties are willing, you can also use pokemon cards to buy things. The main point of the comment is that it's not convenient and common to use crypto to buy goods and services yet.
Visa: get card from wallet, type in number, type in CSC code.
Cryptocurrency: pull out phone, scan QR code.
In the US you can get a 2% rebate on what you spend with a credit card. In effect, you are credited back most of the merchant fees baked into transactions.
In which case cash or crypto requires a >2% discount to break even.
I completely agree that the instances of use as currency is vanishingly small.