And more importantly, when Apple changes some design guidelines, provided you’re using the Cocoa API (which you likely are, if you’re developing for macOS nativ

And more importantly, when Apple changes some design guidelines, provided you’re using the Cocoa API (which you likely are, if you’re developing for macOS natively), your application will look consistent with the rest of the OS. Yes, Apple doesn’t care about backwards compatability, so you might have to update your application so that it runs on the latest macOS version, but there’s no way around it. You either have a gazillion competing frontend APIs to maintain compatability with shit that was written for Windows 3.1, or you don’t care about any of that and end up with almost entirely consistent visual styles across the entire OS.