I find it very useful with cryptocurrency cards, Convenience paying for every purchase anywhere has led to the mass growth of people using credit / debit cards and merchants who accept cards. The advantage of a clear card: no need to go to the bank to withdraw money, no need to worry about carrying large sums of money, and in case if your card is stolen, the only thing you should do is to contact your bank and block your card for prevent illicit transactions.
No doubts that the card payment mode has brought a revolution in the present days with no real need of carrying huge amounts in form of physical cash also that card is safe even if its stolen you can block it , but the fact being a crypto card its fluctuating rates itself can make you poor from a rich in matter of days , If the rates of bitcoin suddenly touches a low peak then you cant even blame anyone for your loss.
Completely agree on this point. the issue of volatility is, probably, the main reason why merchants are so sceptic about accepting crypto.if it's converted immediately into fiat - this is another thing.