Just listening, whereby it was mentioned that 90 + percent of transactions enters the system, yet transaction can be and do become suspended from system controls (for a time). When thinking about just how much cash can circulate amongst people without system controls, it seems like it is not well factored, yet the banks/government know exactly this and need that source of energy under their dominion.
So in this respect, a cashless society; still fiat, without physical fiat paper, is also designed to vacuums this uncontrolled energy. It seem to me that in reality, any town, municipality, city or country - presently, with cash paper, if it is withheld from the cash register system, can circulate amongst people and it has certain energy, its value is agreed upon, it is under the table so to speak. So this paper/coin pays somebody for a tractor/used car/bicycle they may need, and that person buys half a beef & chickens from their neighbor, and they pay another friend a debt they owe, and they in turn may spread it around in cash tips being given to servers etc. without, unless declared, being subjected to system taxes and re-appropriation to the banks. This cash/coin can carry along in society with a certain energy, without system controls (except for its original coming into the market) for a long time until it enters back into the mercantile market and then gets nipped by taxes and interest and banking control. As such, people are paying each other in cash (under the table) everywhere in the world; the service sector sees a bartender for instance make x dollars per hour, which is system taxed and flows through a bank back into cash. Their hourly wages however could be actually + y & z that then moves with energy as described above, outside the systems.
A cashless society would effectively end this (which carries huge implications for people) until people figured out different mechanisms for carrying out what they have always been doing, trying to stay outside the system with the systems own fiat money.