@Chakraleaf
What is wrong with debit cards? What am I missing?
I only have visa debit cards?
If you use the card linked to your main account and it gets hacked, you risk losing access to this for all your other spending, which will be an inconvenience. Also your direct debits could get stopped, with knock on effects.
Sometimes retailers 'double reserve' funds, leaving you unable to buy essentials or direct debits bounce due to lack of funds.
There are also lots of advantages to credit cards that you're giving up by not using them, like purchase protection, cashback free cashflow management, credit history improvement, the latter two are seen as a good thing by banks, as opposed to overdraft use, which costs money and banks think is a sign of poor money management.