I can confidently say I, and pretty much every other engineer I know would have been categorically opposed to having a hackathon to rip out and replace IRS systems no matter who was doing it.
Techies like those of us on HN understand the difference between safety critical systems and throwing ideas at the wall in a startup.
If this was being done in a careful methodical fashion, with deep care given to data integrity and security I'd support it regardless of whose doing it. This 30 day move fast and break things would be bad from Biden, Obama, or in a better timeline Bernie.
If it were happening two years ago it would have used dummy data. USDS wasn’t known for committing crimes the way almost everyone at DOGE has.