First, you have a bunch of for-profit fiefdoms with mutually incompatible payment technologies all trying to own it all, refusing to adopt standards. No government should support non-standard payment systems, whereby they have to support all of them, and the on-going support and development baggage that entails.

Second, they lobby to prevent the proper funding of a fast federal payment transaction system, i.e. making the necessary improvements so EFT can take minutes instead of days. They don't want that to be fast or free because it then obliterates their business models if anyone can just plug into that standardized system. Other governments have done this and that's why they have faster in-country payments (and often even in the Eurozone), despite their "regulations and infrastructure" such as they are.

Your example of QuickPay takes 4-5 days to/from a non-Chase account. That's dog slow, no matter the reason, compared to same country transfers in almost any other industrialized country. I can't think of a slower country off hand.

U.S. banks are overwhelmingly using Windows XP as their OS of choice in ATMs, still today. The height of technological achievement!