I have been using these updates at a rough history. I want exactly that tooling in the database for those reasons. Dev resources are tight though.
They are seeing why it is better when I come through and can pay exact amount easily while they are running around looking for change because someone has a 1000 peso bill (~20 USD) and they do not have the change.
The remittance market and foreign bitcoin tourists are the real killer apps. So much money is lost in frictional losses moving money here.