Earlier quoted context omitted.
I am talking from the perspective of the merchant . Imagine bogus chargebacks because of buyer's remorse or purchases done with stolen credit cards. None of this happens for a merchant that accepts crypto.
Just because crypto doesn't offer chargebacks doesn't mean that the customer is not legally entitled to a refund. Depending on the jurisdiction of the merchant and the customer there are a number of scenarios where the merchant is legally obliged to providing a refund. For example, in Germany when a minor makes the purchase, the transaction may be invalid and the merchant has to refund the money.
The point is not to have a system of final purchases, but final payments.