Every country says this about every other country. The UK has HS2, and we point to Germany. Germany has Stuttgart 21 and they point to Spain. Spain has the Sagrada Familia. Spain points to China, and China has the HZMB [0]
This stuff is really really hard, and standards have evolved hugely. The london underground would never be built today, because of the ignored costs. HS2's massive problem isn't that we spent £100m on a Bat tunnel [1], it's that nobody was willing to say no because that decision is pinned to you but the blame absolving is "someone elses problem".
[0] https://en.wikipedia.org/wiki/Hong_Kong%E2%80%93Zhuhai%E2%80.... [1] https://www.bbc.co.uk/news/articles/c9wryxyljglo
Your analogy is like saying that everyone thinks someone else is a faster runner: amateurs point to collegiate athletes, collegiate athletes point to elites, elites point to Olympians. You can find someone in each of these categories who has run a bad race, but that doesn't invalidate the existence of the differences in ability.
> Funny how every other developed country manages to build more infrastructure cheaper despite having stronger unions and stricter regulations.
I picked a handful of absolutely colossal overspends on massive infra projects to point out that no, not every other western country is doing so. All countries have their success stories and mega disaster projects
What mega project success stories does the US have in the last 20 or 30 years?
[0] https://english.elpais.com/elpais/2014/05/13/inenglish/13999...