Yes, they do break backwards compatibility in many many other ways, but you could put a technical layperson who is used to Mac OS 9 and put them on macOS 11.4 (for those unfamiliar, Apple's OS has been at 10.x for about 20 years) and they would still reasonably be able to find their way around.
One element especially (the global menu bar) is why I got my parents to switch to macOS. They had to learn where 'print' or 'edit' or 'save' was once, and now they can find it for any program, and it'll probably still be in that place in 20 years time.
Its also why I think it's sad that Gnome abandoned the global menu bar. It's an amazing concept that if stuck with makes computers so much easier to use for a large contingent of people.