Even if you could theoretically build all that infrastructure, the maintenance burden would just crush you 20 years down the line, it would crush your kids and your grand kids.
The real tragedy is that cities are unaffordable.
As for maintenance, I'll elaborate on that story. People on the road of this town had been petitioning the government for years to get their road paved. Each time it'd rain, the road (made of mostly compacted dirt) would get into pretty rough shape. There'd been several accidents precisely because of this, particularly with kids, and it was also pretty rough on people's vehicles. People, as in people - not the government, would patch it up, but that'd take time, and it was non-trivial.
The government clearly had no interest in paving the road, so eventually the people raised the funds themselves over a rather lengthy period of time, and then paved the road themselves. As for maintenance, spot repairing potholes is a whole lot easier than dealing with part of a road getting washed out by rain. It wasn't cheap. And so things like this really make you wonder why you're paying taxes. And then you see headlines of a government and president seemingly gloating about sending hundreds of billions of dollars to countries half way around the world. It just doesn't inspire positive feelings, and makes the government seem desperately out of touch.
[1] - https://www.pewresearch.org/social-trends/2021/12/16/america...
This is why things like 'America first' resonate so strongly with rural communities. It's not some jingoistic message, let alone some sort of a secret dog whistle for some sort of a race nationalism thing. It's just people seeing unimaginably large amounts of money being spent, yet with next to nothing to show for it.