Remember when Apple replaced mDNSResponder with Discoveryd? It was total disaster, %95 CPU usage and all kind of connectivity issues. They had to bring back mDN

Remember when Apple replaced mDNSResponder with Discoveryd? It was total disaster, %95 CPU usage and all kind of connectivity issues. They had to bring back mDNSResponder not long after. So there's no guarantee that the replacements would be bug-free. If anything, the current stuff is battle tested through the years and gets better with each scar. I would guess that they are also employing all kind of hacks, i.e things that are not supposed to be like that but are like that and they will break a lot of things if they make the new code work the way it is supposed to work. There's even XKCD for that: https://xkcd.com/1172/ https://xkcd.com/1172/