For Cryptocurrencies on the other hand, you never give you private key to somebody. You always decide yourself which amount to transfer. No chargeback is needed for this model.
I have an EC-card and chargeback is only available for pull-transactions, not for push-transactions.
I've initiated chargebacks before, but overwhelmingly it's not because I've been overcharged (that only happened once and, ironically, by a company that subsequently launched an ICO...): It's because I did not receive the product/service, or it wasn't as advertised.
And that is just as much of an issue with crypto.
Keep in mind, in many cases the standard advise to consumers is to use credit, NOT cash, purely to be able to obtain the protections of chargebacks, but cash already has all the advantages you list as meaning chargebacks aren't needed for crypto.
EDIT: Apparently chargeback may be the major issue for porn payment processing:
With a credit card, you'd do a chargeback. With crypto there no protection from dodgy sites.
So, no, not just for physical goods.
I often hear lack of chargeback being touted as a feature for cryptocurrencies but it's more like the lack of a feature. It's obviously beneficial if you're in the shoes of the seller but if it's so great then why does chargeback exist in the first place?
Put yourselves in the shoes of a porn buyer, would you really put your billing info on bigtitties.ru if you knew that if they steal your money you have no recourse whatsoever? Also there's now a transaction on an immutable public ledger that might trivially show anybody who cares to look for it that you're buying incest porn online?