This is the real cause. At the enterprise level, trust outweighs cost. My company hires agencies and consultants who provide the same advice as our internal team; this is not to imply that our internal team is incorrect; rather, there is credibility that if something goes wrong, the decision consequences can be shifted, and there is a reason why companies continue to hire the same four consulting firms. It's trust, whether it's real or perceived.
Children do the same thing intuitively: parents continually complain that their children don't listen to them. But as soon as someone else tells them to "cover their nose", "chew with their mouth closed", "don't run with scissors", whatever, they listen and integrate that guidance into their behavior. What's harder to observe is all the external guidance they get that they don't integrate until their parents tell them. It's internal vs external validation.
So much worse for American companies. This only means that they will be uncompetitive with similar companies that use models with realistic costs.
I have seen it much more nuanced than that.
2020 - I was a mid level (L5) cloud consultant at AWS with only two years of total AWS experience and that was only at a small startup before then. Yet every customer took my (what in hindsight might not have been the best) advice all of the time without questioning it as long as it met their business goals. Just because I had @amazon.com as my email address.
Late 2023 - I was the subject matter expert in a niche of a niche in AWS that the customer focused on and it was still almost impossible to get someone to listen to a consultant from a shitty third rate consulting company.
2025 - I left the shitty consulting company last year after only a year and now work for one with a much better reputation and I have a better title “staff consultant”. I also play the game and be sure to mention that I’m former “AWS ProServe” when I’m doing introductions. Now people listen to me again.