Question regarding 'balance' and decisions

First of all, yes I'm posting on an alt. My questions have nothing to do with my actual character management, hence, this level 1. My mage is not amazing(yet! :D). Please keep replies in this thread polite.

Here's my thinking:

Arcane: Everyone knows this spec is not good in PvE and I think I've only seen 1 or 2 Arcanes in PvP. It seems they just use far too much mana to be able to compete. It's been tested with Sims, real raid testing, etc. And yet, still, no fixes for this at all! And there are more issues than just Mana usage. Many players would LOVE to be able to raid as Arcane, but it does not seem feasible.

Fire: Far too dependent on RNG. Fire needs lots and lots of crit and then start praying that RNG is on your side. The gear just doesn't give enough. It's clunky to play, also, as others have described. Ignite munching; this has not been resolved and it is not as if this is a new issue, either.

Frost: Increased turret damage. Deep Freeze change; One of Frost's main abilities that is on a decently long CD barely does about as much damage as other classes short CD abilities. SW:D for example. Short CD, comparable damage.

Time Warp: I don't need to explain this one.

We Mages have MANY issues that need addressing. Instead, Mages are given X, Y, and Z fixes which not only address almost none of the problems above, but, even ones I did not include that I'm sure others will list if so inclined. On top of all of these things, the well-known and respected mages do testing in several ways and come back and basically say it's rubbish and did not particularly help these things. As many, many, many other posts in the last few days have demonstrated.

So, here is the question:

Why is it that once a patch goes live, and even on the PTR which gives people time to test things and give input before they go live, does it feel like Blizzard either completely ignores feedback or reads it and refuses to address them? It seems as if people not only test things on PTR, but come to the exact same conclusions once changes go live, and yet, nothing is done... as if it's all just a big waste of time.

I am not a top 20 world guild or even within a mile of them. But, I do read a lot. And I notice the feelings and facts stated and demonstrated in many ways by others. It just seems like players are not listened to at all in many respects.

And it's not just Mages that this is happening to.