Comment by saurik

Which again, is obviously the wrong answer, as that same argument could try to be applied to Windows and would fall immediately: Windows 95 knows nothing of my new hardware, and yet, by and large, works fine. There is something unique about macOS and Apple that causes their hardware to actively not bother to maintain any form of backwards compatibility with the software that runs on it (which is not to be unexpected from Apple, but still), and that must be present in the answer to this question (which is done really well by mschuster91).