Financial anonymity is important — just because the panic of the day is “secret Nazis” doesn’t make this untrue. Consider a woman trying to escape domestic abuse, who has been financially trapped. If all transactions are untraceable, a $20 to “a grocery store” here and there can very well be her escape route. Same goes for oppressed individuals attempting to escape abusive families, neighborhoods, countries. Realistically the people you’re most worried about have used what they’ve always used to conduct their transactions anonymously: cash.
Just because the government knows about my bank account doesn't mean my wife/neighbor/rando does. No one is talking about radically public bank accounts; the surveillance is only for the government.