Payments by cash have been drastically limited by recent laws.
Cash is still widely used for small, medium amounts. There's no incentive at all by CC issuers to let the petty payment flow, both for business owners and consumers.
In any survey Amex requires me to submit on a monthly frequency I try to let them understand the many flaws their programme has.
One for all, the robbery of 1 MR point every 5 transferred to many airlines FFP.
It translate in a penalty of 25% for award flights.
US folks churn and enjoy bonus transfer bonanza, in Europe they act diametrically at the opposite.