It seems that somebody doesn't realize just how much stuff is in the game, nor how much gets put into the game on a regular basis. Here's a hint: it's not a small amount. And all that stuff that gets put in? Yeah, it changes balance.
It seems to me that they implement whatever sounds cool at the moment without regard to game balance.
Fail to see how I'm wrong here.
Blizzard is a professional gaming company. They do this ###@ EVERY day. It ought to be second nature to them.