Don't forget stand-ins, much of this hasn't discussed that credit card networks do a lot of "stand-ins" when the issuer is unreachable (bank goes down, latency too high, etc). It's a bit unclear how things like Wero would operate when a network issue hits as Wero and EU rails won't just assume the liability for the transaction and hope it clears later as it does on Visa/Mastercard.

Very good examples. I'd add that Trust and connections are also huge in payments. Even if your technology is perfect, you need to integrate with tons of different systems to get full coverage, and the people who run those systems don't sign contacts with just anyone.