I am an amateur mechanic, but have done a great deal of very technical work. My only formal training is three years of high school shop classes, everything else I learned under or in a car. The newest thing I have worked on is a 2022 GMC Sierra. Seemed to be pretty much the same as my 2003 Chevy Silverado.
You are definitely correct about foreign (non-USA) makes. My wife had an Audi when we got married. I own a small toolbox of tools specific to her Audi S4 that I will never use again, but that was a 2006, so this issue predates 2013 for the makes that it is true about.
Admittedly, I try to avoid fuel injected vehicles. So I don't go out of my way to work on new things.