Why do they need paper money anyway? Is there something more legitimate about a piece of paper with many 0s on it vs redundant electronic storage of record?
If not, then the current system where the digital records refer to actual cash still needs there to be actual cash somewhere. Normally you’d have it in the national bank, but since they started charging it’s better to stockpile paper.
I guess it seems...funny to me that the one level of abstraction (paper money representing the power to exchange goods and services) is so much more preferred to the other (digital representation of that power). Already now, most of my money is represented as a digital recognition that I own part of a pile of cash that I will never actually take physically.