No one? That's a rather brash statement to make. Here in Ireland I can count on zero hands how many people use credit cards on a day to day basis. Debit cards are the norm in much of the EU I would assume.
Rewards on top are an added bonus.
The argument that you save interest on savings account doesn’t make any sense at all because I count my credit cards towards my emergency buffer. If I maxed out the credit card I would absolutely make sure to keep more money in my savings account.
I get that it’s different for people living paycheck to paycheck. But arguing that credit is a solution for the poor is a slippery slope. We should solve those problems other ways.
You come out ahead because the card issuers expect to make money from you because you'll stay with them a long time so offer substantial sign up bonuses (I don't) and that you'll pay interest (I don't). There are generally annual fees, but if you ask they'll often waive them (if you spend enough, again not accessible if you're living pay to pay).
It's ~effortless (bills paid automatically in full from a mortgage offset account) and saves money even without rewards and other perks (0% loans via interest free "balance transfers").