That's not it. The thing is that they refused acknowledging that partisanship would evolve. They preferred to hold on to the illusion that everybody involved in office would always be altruistic and solely work for the greater good, which was laughably naive even then (as many people pointed out to them).
In retrospect, they should have not made First Past the Post voting our voting standard. That is primarily what has caused our partisanship to arise to the extent that it has.
We can still change the voting system in each state individually to move away from First Past the Post, but that requires each individual state to have ballot initiative going that people can vote on for a new system such as Ranked Robin voting, STAR voting, Score voting, or even Ranked Choice voting.
It wasn’t intending on having an army at all, they thought a standing army would lead to tyranny so they came up with the 2nd amendment instead so a militia could be called as needed
Which tbh was really short sighted as well. Every nation needs an army to hold onto their self determination. And it needs to be well funded. Such has been proved repeatedly throughout history
it's a classic anarchism vs centralization struggle, happens a lot in federations historically. Sometimes you do need everyone to stop slacking off and fight off the invaders.