[westhom]

>Transaction reversal is indeed outright harmful to honest vendors, and is only really necessary for the legacy systems because the legacy systems have borderline zero protection against dishonest vendors retaining customers' payment information and pulling money from it

This isn’t the only form of dishonesty. There’s cases where you initiate an honest transaction, the vendor ships you something you didn’t ask for because they are trying to clear inventory, and then refuses to refund or exchange. Then you file a claim with Amex and get your transaction reversed in about a week.

[IanCal]

You can simply opt in to those kinds of setups.

The flipside is there are times I've been unable to pay with cards because the processors deem it to be too large of a risk, despite me being happy risking my own money. Or, see the risks people take running businesses on PayPal - large companies able to reverse transactions / hold your money solves some issues but raises others.