* Never pay anything in the way of fees or interest, including international fees.
* Never have a positive balance sitting in a transaction account earning zero interest (or as Americans would say, checking account).
* Never worry about overdrawing my transaction account.
* Card authorisations don't deprive me of my own money (eg hotel security bond).
* Importantly, in the event of fraudulent use of the card, the bank wears the damage while an investigation is underway.
A debit card might tick the first item on this list, but not the rest.
But if they accepted lightning payments, I would pay them in BTC.
("rewards" purposely in quotes since it's not really a reward, but amex/visa/mastercard want us to think it is - there's no free lunch)
Merchants are free to offer more reward points or discount coupons for cash payments, though.
I don't fly much, so I dont feel the need to harvest points. I dont want my purchasing data picked up by any more companies than necessary (my bank & the vendor), and all the various chargeback and refund facilities offered by credit card companies are a bit less critical as Australia already has stronger consumer protection law around goods fit for purpose & refunds. Credit scores are not really a thing in Australia either, you are assessed on your current ability to service a loan rather your history. Defaults still show up & count against you, but 'building good credit' is again an American concept.
Credit cards are a product designed largely for the American market.
If you do have money, why do you need to borrow money you already have?
Classic mistake, using credit or specifically a credit card does not always mean you dont have the money.
> If you do have money, why do you need to borrow money you already have?
Do you have a mortgage? Do you also have any money in a bank account / savings / cash in your wallet? If so "why do you need to borrow money you already have"?
Indeed the mortgage example is even worse, because typically a morgage has interest paid whereas a credit card paid off within the month does not.