I don't disagree, but consider how much more useful is the ability to chargeback in a pull-based system where anyone with a semi-public piece of data (your cred

I don't disagree, but consider how much more useful is the ability to chargeback in a pull-based system where anyone with a semi-public piece of data (your credit card number) can take money from you, versus a push-based system where every single transaction must be initiated by you.