> the same is true of bitcoin deposits held by the public at crypto-exchanges. These bitcoin balances
are bitcoin
No, those balances are not bitcoin.
If it is not a balance assigned in the distributed ledger, it is not bitcoin.
I understand that the ious in the dollar system are the money. You are misunderstanding the difference in how the reserves would be generated in a world backed by bitcoin. Saying bitcoin is the same as an iou not on chain is an egregious misrepresentation.
Bitcoin in a world with “bitcoin notes” backed by fractional reserve banking would be very similar to gold when dollars used to be exchangeable for a set amount of gold. It is not the dollar in that comparison, it is the gold. But it has the added property that it is easily transportable and could also act as a direct form of payment.
It is not practical to buy a sandwich with the equivalent dollar amount of gold, even when there was a static exchange rate between the two when we were on the gold standard.
It would, however, be practical to ALSO directly exchange bitcoin, in addition to exchanging “bitcoin notes”. Direct exchange is the original vision of crypto, but a world where people primarily exchange “bitcoin notes” instead of bitcoin still benefits from the fixed supply of what the note can be exchanged for.