It is likely that the credit unions that wrote their attitude to the development and implementation of national CBDCs did not give their arguments in numbers. Because the implementation of CBDC will actually pay off very quickly and in the long run will bring huge profits and cost savings to every state. This is really a purely lobbyist opinion and is unlikely to be paid attention to in the United States.
Serious calculations show the absolute benefits of implementing CBDC, because transactions in this case become faster, cheaper, transparent and efficient in every way.