To use an engineering analogy, if the government were a software application, this is very much like a senior engineer going on a major refactor of a production system, causing huge breaking changes for the sake of "principles", without consulting product, CS or QA. For the sake of argument, lets grant that there's some force to those principles. Is that justification for suddenly breaking a system that was working and causing a massive amount of confusion for downstream users that were blindsided and now have to do massive updates of their own?
Okay, now lets suppose that the same senior engineer was secretly (or perhaps even openly) beating the drum for some feature changes behind the scenes, and nobody liked the features he was proposing. Now after the refactor, it turns out that for "technical reasons" the features now work the way HE wanted them to. When asked, he claims it wasn't a political decision, it was driven purely by engineering concerns, "cleaning up tech debt" and so forth, he claims. Might it seem to you that the refactor was just a smokescreen for just getting the feature changes he wanted into production?
If this engineer was at your company, would you keep them on, or fire them as soon as possible?
Now according to your argument, you view SCOTUS as the engineering team, and Congress as the product team. You're saying that ten years after you release a feature, the technical lead can say "Hey, you remember that spec for those features we released to production 10 years ago? I think we did it wrong, we need to refactor it so it works right. Also that was the old engineering lead, and I never liked them anyway. It'll be a major breaking change, but that shouldn't be an obstacle to doing it right this time. Should we ask Product or the Executive team first? Of course not, we know what we're doing."