Earlier quoted context omitted.
Especially for MacOs, where you can expect apps to stop working after a new new major OS versions, this is really nice. Meanwhile, Microsoft maintains an amazing degree of compatibility. I haven't tried, but I have a feeling Office 97 works in Windows 10.
Traditionally, that was the case, but recently older applications have been breaking in recent versions of windows. And windows and macos both have hacks in place to fix older versions of popular applications (ms office, adobe suite, etc.).
Mac backwards compatibility isn't as bad as some people say—I have a decade-old program that still works in Mojave, for instance—but Windows is a lot better.
The platform with awful backwards compatibility is iOS. And there, you don't even have the option to dual boot or downgrade. The fact that no one cares says something about how much we value mobile software...