You mean like UPI? For a nascent industry such as India I imagine you could: but for a legacy infrastructure such as that of the US - very advanced a few decad

You mean like UPI? For a nascent industry such as India I imagine you could: but for a legacy infrastructure such as that of the US - very advanced a few decades ago but now showing its age - the momentum is too hard to deprecate and start over. Just like how fast the developing world had pretty good mobile networks in a short amount of time. There are still a lot of lessons to learn from the Indian model but I guess the US incumbents would artificially add road blocks via legal or subtle measures to maintain the status quo and instead offer band aid solutions.