That sounds like a good reason/background story for Apple to change the existing mDNSresponder, but how are the issues in the article not signs of 10.10 being b

That sounds like a good reason/background story for Apple to change the existing mDNSresponder, but how are the issues in the article not signs of 10.10 being broken? (The article was written before 10.10.2 was released, so some bugs might have been fixed.) I think the only misguided part was to encourage people to replace system files.