It would mean that when money is moved, it would land in real time. It would be data-rich payments that would provide end-to-end traceability, which can help reduce fraud and better enable investigations. When you look at the delivery of emergency relief benefits by government, for example, or even just transactions between businesses through supply chains, it would mean that businesses and individuals could put their money to work immediately upon receiving it.
The reality is that RTR—its efficiencies and level-playing-field pricing, regardless of the size of the host financial institution—will come at a cost to large incumbent financial institutions.
Delayed settlement means that the institution that's moving the money accrues interest or is able to otherwise utilize funds when the settlement is delayed. If I send you something at 6:00 p.m. on a Friday and there's a holiday Monday, that money is not going to land until Tuesday morning at 9:00 a.m. When you compound each of those transactions, it's a significant amount and a significant barrier to co-operation.