Once this is widespread, then the only reasons to use credit will be cashback/points or paying in credit.
[1] https://www.gov.br/secom/pt-br/assuntos/noticias/2025/02/pix...
What means that if you have a very normal behavior, yes, it's more convenient. If you deviate from the norm in any way, it's an unreliable piece of shit that will leave you hanging without money the moment you need it most.
And as deviant people drop out of that system, the bar for deviance gets lower and lower.
1. "Tap to pay" refers to a technology, specifically NFC communications. Anyone can use it, not just "credit card processors". For instance, many transit agencies also use NFC for their passes/tickets, and those obviously aren't being intermediated by "credit card processors".
2. Any sort of centralized system will be susceptible to "all the usual bullshit credit card processors impose". At least with credit card companies there's theoretically a degree of independence from the government. A government run payments system, staffed by government appointed cronies would be even more susceptible to government pressure to block certain groups.
>You just scan a QR code and pay.
Tap to pay (ie. NFC) with credit cards is as convenient and arguably more convenient than a QR code solution. At the very least you don't have to worry about aiming at the QR code and waiting for it to scan/focus, which is especially important if you're using it on transit systems.