This is good news if the final version of OS X 10.10.4 ships without the troubled discoveryd.
The 'discoveryd' problems have cause usability misery for some users.
I’ve had my own inexplicable and disturbing network failures which require disabling networking, then re-enabling it—even as the same local LAN has no issue at all on a 2nd machine. Maybe it’s discoveryd, maybe not but I’m hoping. And then there is the Pathological Network Performance in Apple OS X issue, but I don’t expect Apple to fix that one.
Now if only Apple can get more adults in charge for OS X, things might start looking up on Apple Core Rot.