If this were issued on multiple blockchains, ranging from a government-run permissioned chain, to public blockchains like Ethereum, and if this didn't accompany

If this were issued on multiple blockchains, ranging from a government-run permissioned chain, to public blockchains like Ethereum, and if this didn't accompany any elimination of physical cash, but acted instead as an alternative to it, then this would be strictly an improvement in the utility of government-issued currency. The worry is that it would be a substitute/replacement for physical cash, which would mean a massive enabler of private and unregulated economic interaction being eliminated from an already too surveilled/centralized/rigid society.