1) They know about this.
2) What you see is always only the vocal part of society (potentially vocal minority/silent majority).
3) A news post helps to reach a large portion of the player base to inform them about issues they were not aware of. If you want to engage in conversation with Blizzard, write constructive criticism. I've tried that time and time again, most recently here. If they feel that they have something to share, they'll let us know. I guess that's just not the case.
There's a dangerous line to cross when trying to make someone aware of your frustration. For example, if you're a student and think you're treated unfairly by your teacher, you can try to argue and reason. But as soon as you even slightly overstep your boundaries it'll backfire and you'll not only *not* get the better grade you hoped for - you might even fail the class. A lot of people are taking their frustration and uttering them in a way that might Blizzard just give up on the community, going like "all those PC gamers are annoying idiots; let's stop D3 and develop D4 as a casual, Farmville-style P2W tablet game".