You'll get different cash back, sure. Which was sort of the point; it's part of what makes CC useful.

I was noting that there is nothing fundamentally different between say you accepting a payment in bitcoin and refusing to cough up the key when told to reverse it, or accepting a payment in cash and burying it then refusing to tell police where.

Fundamentally there are mechanisms to reverse this, or punish/constrain you for obstructing the process. Some payment systems have them built in at a very low level (CC chargebacks), some rely on professional standard (hold harmelss), etc. Some rely on court systems. That's a trade off of convenience vs. risk, but doesn't change the fundamental point that a payment system without a standard reversal mechanism is going to have limited use.