> If you want to switch the world to a debit-based system where economic transactions are limited by cash on hand, I'd argue that's a poorer and less dynamic world than the one we're operating in today.

Disagree. Credit has its uses, but debit is superior for the vast majority consumer transactions: lower fees, lower risk, instant settlement, easy P2P transfers, and broader accessibility. That we've become used to credit card payment system in the West is largely a historical aberration that needs correcting.

Also, I'm a bit biased since I live in China, but WeChat Pay and Alipay are so far superior to the credit card system that I can hardly find a single redeeming quality in the latter. China was lucky in that it leapfrogged the traditional credit card system since it didn't have that historical baggage.