Wouldn't you use PayPal as a digital wallet for you credit cards & reverse fraudulent charges through your credit card company?
Now if you link an actual bank account to PayPal, pay with that bank account, and get scammed, then that's your actual money spent, and no shit that's harder to reverse. You'd probably have to refer to your bank, and they may not do it.
Not in the slightest (cost me 0), and I do.
Not the main selling point.
That is a good use case: charges easier to dispute & reverse. Fraudulent credit card charges don't disrupt your available funds.
A normal bank card spends your real money. Disputing through a bank may take longer. Until the bank returns money to your account, that money is gone: fraudulent charges to your bank account disrupt your available funds.
That's a use case for me: risk mitigation & flexibility to optimize returns on my savings.
Assumptions
Constantly transferring between accounts for every single transaction is inconvenient. Leaving money in the checking account isn't ideal due to low interest earnings & risk of unauthorized debits.
Solution
The credit card is simply an instrument to allow me time & flexibility to move money I already have to pay expenses. The money is usually earning kickass interest (at least enough to beat inflation) somewhere and takes a non-instant amount of time to transfer.
Always completely pay off a credit card by the payment due date. A credit card is a shitty account to carry a debt (any non-0 balance past the due date): only dumbasses do that.
If it works like in the US, then as long as you make mortgage & all other bill payments on time, completely pay off credit cards by payment due dates, and keep credit utilization low (at most 30% of card's credit limit), you should be fine.
Starting a mortgage temporarily lowers your credit score until it recovers with consistent repayments over a few months. Then the added credit mix usually improves credit scores.
Are mortgages not paid there in regular installments with due amounts like in the US?
You don't have an account (maybe savings) that earns better interest? You're not saving for emergencies, retirement, or goals?
It's usually just slack time (until payment due date) to make a payment you would already make some other way.