That's super broad and I think there are complex reasons why each of these has failed, but it's pretty clear that stagnation hasn't helped and has probably actively caused harm by letting incompetence become too common in these areas.
The US has lots of infrastructure that needs repair or replacement, but there are very few areas that do not have clean water, or reliable electricity (Sans extreme weather which causes disruptions in every country), and roads and bridges are all safe to drive on (when was the last time you read about a bridge that collapsed from lack of maintenance?)
The US has its issues, but it does actually have a huge amount of superb, world class infrastructure.
Strongly agree that fewer changes equals fewer bugs, it just comes down to trading that off with shipping value in your product.
Civil and mechanical engineering are not static fields. They come up with new materials, new methods, new ideas. They have tooling to understand the impact of a proposed change and standard ways to test and validate things. It is much easier to predict how long it will take to both design and build things. These are all good things.
We would all benefit from fewer cryptoAI startups and frameworks of the week and more robust toolchains tested and evolved over decades.
Tell me about all the on time and under budget civil/mechanical engineering projects that are happening.
Do you think that just because they have physics to lean on that they can just like press solve and have accurate estimates spit out?
Edit: I totally agree that more long-lived battle tested software toolchains and libraries would be great though
