Treasuries only receive the favorable yields they do because they were considered the safest asset in the world. Any indicator of potential haircut is going to cause a rapid (further) loss in confidence and a spike in yields, leading to a debt spiral. This is why there was a fear of the implications of DOGE controlling the Treasury payment system (BFS), potentially leading to non payment and default. The capital markets are built on a foundation of trust. If you want continued access to capital (and with debt at ~123% GDP, it should be obvious that the US has no choice but to have continued access to the bond market), you must respect the trust relationship.
I will admit that, at the time, I did not see EU debt holders accept it, but accept they did. I know that cultural differences in US may require a different approach that go beyond PR spin ala 'temporary refund adjustment' since there is money on the line, but I can't help but wonder if it is not coming anyway.
https://www.cbpp.org/research/federal-budget/doge-access-to-...