You can have instant settlement while still maintaining fraud safeguards (e.g. daily payment limits) and remediation mechanisms (e.g. reversing fraudulent transactions). With modern 2FA and device-based security, this risk is extremely low. Not a risk that justifies a 2.5% tax on every transaction plus all the other disadvantages of the credit-based system.
You can have instant settlement while still maintaining fraud safeguards (e.g. daily payment limits) and remediation mechanisms (e.g. reversing fraudulent transactions). With modern 2FA and device-based security, this risk is extremely low. Not a risk that justifies a 2.5% tax on every transaction plus all the other disadvantages of the credit-based system.