If this was about a useful part of the economy rather than financialized credit access, I would care. Paying 10x to US residents to provide a better Amex experience really doesn’t incentivize anything that is long term useful. Now when materials scientists and skilled scientific technicians are fired from US based jobs, well that is a problem. The economy in the US has fallen prey to the demands of irreality based capital which is seeking, not profit, not good products and healthy trade, but seeking to extract capital and to erect legislative barriers to Adam Smith style competition (between innovative small businesses striving to find an innovative way to push product utility up a bit). If you can’t brag about the good your job is doing for people, life, or history, try again.
Credit cards alter the power dynamic between customer and merchant, especially in a world where so much commerce is remote. I appreciate protection against fraudulent merchant activity, as well as the ease of use relative to alternatives (who likes carrying cash or a checkbook?). Not having to pay for a month is nice but not the reason I use credit cards.