That's the point: We didn't need to, because they had a process they followed and it worked. It was probably fairly bureaucratic, which is reasonable when we're talking about trillions of dollars. Treasury moves slowly but they do move in the right direction - TreasuryDirect was kinda early and had an absolute klunker of an interface, but it's been improved a bit over time and is now usable if still chonky. Federal and treasury-mediated transfers went through. People's confidential payment information wasn't disclosed. That's kind of what I and most others ask of the treasury -- even if I occasionally took to social media to scream about their terrible password entry interface and the annoyance of dealing with medallion guarantees. :-) And they got on FedNow pretty quickly once it rolled out, though of course I wish either the treasury or the fed had provided an instant payments system like a decade earlier. (But that's on the fed.)
But I'm OK with the idea that change speed is somewhat inversely proportional to value at risk. Might be better if it was 1/log(value).