Technocrats at Amazon continue to push cashier-less stores, first with Amazon-Go and now with its subsidiary, Whole Foods. Cashiers do not make up the largest portion of grocery employees, but they will eventually be missing from many stores as this trend continues, and the use of cash will diminish, forcing people to pay with smart phone apps.
As a matter of Technocrat policy, "If people can’t hoard physical money, it becomes much easier to cut rates far below zero." This means your banked funds risk being plundered at the will of the policy makers. Eventually, all money accrues to the takers while the depositors see their wealth vanish.
This is not a battlefield weapon as much as it is for simple crowd control. It has the potential for egregious violations of free speech and human rights if used by governments to suppress dissent. Technocrats invent because they can, not because of a demonstrated need to do so.