>that the EU has to become more like a confederation, more closely integrated than it is now but less integrated than modern federations like the USA or Germany. Closer to the early USA (where the states had more power compared to today and the federal government less).

Do you see the perfectly exemplified contradiction here? Centralized government power always tends to want more and more control, more and more power over time, while shedding any and all forms accountability. It never stops and says "ok, we have just the right amount of control now, we can start back off and leave everyone be". That never happened in history of humanity.

The evolution of the US central government you gave is the perfect example of this overreach that grew with time and the best argument why we shouldn't try to emulate that. Because so is the EU compared to how it was 30 years ago, and it will just keep growing and swallowing more control and influence over its members, with less and less accountability, and it won't just stop when you think the right balance has been achieved. It will only stop when IT decides it wants to, but by that point it will be too late for you to have a choice in this.

Plus, even ignoring all that, what worked in the US 200-300 years ago, can't simply be applied to Europe now. You can't simply copy-paste policies across continents, cultures and time, and imagine it will simply Just-Work™.