Yeah but sometimes it seems like people are not aware of this. Lots of crypto advocates are talking about future where crypto will become de facto currency and

Yeah but sometimes it seems like people are not aware of this. Lots of crypto advocates are talking about future where crypto will become de facto currency and transactions will be done in BTC or some other tokens. So merchants would price their goods and services in crypto tokens. We are definitely not there if we ever will be (personally I am skeptical most of these tokens will turn out to be more than fads few years from now). Merchant still gets paid with USD, GBP, JPY, EUR or whatever currency is local to the merchant. It also must be more inefficient to use Bitcoin or gold card. Because there is an additional layer of conversion from BTC/gold to fiat which I believe is not as advantageous as paying with fiat which uses daily Visa/MC interchange rate (Visa/MC set exchange rate for currency pairs once per day so it doesn't fluctuate when you buy 2 coffees per day for example) and is as good as you can get. I imagine whatever service you use to change BTC/gold to fiat in the background must incur some fees albeit small ones (Coinbase or something else that's used by these cards, the API call you make to Coinbase to change BTC to USD will charge you small fee). So you will be paying more on fees / get worse exchange rate. I still don't understand what's the advantage of using these Bitcoin or gold debit cards as it seems you are just paying extra fees for extra layer of conversion. I'd stick with old school boring bank debit cards since transactions are done in fiat anyways.