Comment by rblatz

GNU is Not Unix! Nor is it Linux. MacOS was a Unix, not sure if it technically still is, but if not it has Unix roots. And it is simple, the vast majority of users don't need a CLI package manager, they get the App Store and downloading from the web. If you want one there are package managers. Also Darwin is open source, it isn't developed in the open but they do release sources last time I checked.