> the idea that physical money primarily aids social fraud, money washing and other illegal activities is pretty well established

I think that's very hyperbolic. In france most people I know carry cash and use it regularly (not as much as cards), the gen X and older tend to find it strange to pay for small sums (eg bread) with card. Germany is infamously almost cash-only. In many Central Europe countries, shops taking card is not a given (Bulgaria, Hungary).