> First this isn't true, as most good comes with legal guarantee, retraction rights and so on.

Finality of the underlying transaction is a different concern than that of the means of payment.

Cash is indeed, at least in some jurisdictions, the only thing you can be sure to not have taken away from you when acquired bona fide, even if it turns out to have originally been stolen from its legitimate owner.

Practically, some other payment methods have similar guarantees, though (for example, you generally can't have money clawed back as a merchant accepting credit or debit cards in person).