The core defect in the design is the Senate and the way states were admitted. We have a territory/colony with limited political rights that has a population greater than the bottom four states.
Those small states exert enormous influence and essentially ensure a weird conservative dynamic that anchors a lot of social issues.
Not because of the politics of the day - because resource extraction is always conservative by nature as the core aspect of the business is minimizing overhead cost. Agriculture flipped into a purely extractive business as people have been removed from it.
It's called the United States for a reason, not the United People. What you're obviously desiring would result in a series of vassal states (large cites governing themselves) with most of the country (rural) acting as feudal serfs.
If you think the current governance scenario in the United States represents the apex of republican democracy, your patriotism is clouding your judgement. The current trends as they are have been devastating to rural people. I live in a county that had 500 dairy farms in 1970, 80 in 1990 and 2 today. Just that industry represented probably about 10k good paying jobs.
Most rural areas are the economic equivalent of inner cities with more space. But of course, if you don't care about people, just the sacred abstraction of "states", so I suppose that's ok.
Not quite as old, or at the scale of the Dujiangyan system, but still evidence that the “Western” culture did once build for long term. Less ancient, but more indicative, are the European cathedrals built by multiple generations over a century.
If anything the West's culture has been doing more long term planning. It is quite difficult to force an economy not to produce something.
https://aqicn.org/map/world - US is generally green and yellow, China tends to dip into the oranges and reds, especially in the industrial zone. It is tightly linked to the fact that China has a powerful electricity grid.
I wonder if this is more of a cultural thing, meaning Western cultures being more aligned to short-term gains instead of long-term gains. I mean, look at the Dujiangyan irrigation system that was build 2500 years ago and is still maintained until today. This isn't something the Western world would even consider.