Although you may be slightly thrown off by the different color at first it makes staring at your screen for awhile a lot more bearable. In games where there's insane spell animations or bright lights it makes it easier on the eyes. Definitely NOT just for show.
I think Blizzard has reached a point of just discontinuing major PvP/class changes-at least in the middle of a patch/season. It sorta reminds me of BC-we never really saw major balancing changes in the middle of a season. At least back then, they had the excuse that arena was new and wanted to let things play out to see how thing worked.
There was a glimmer of hope when they immediately nerfed rogue/priest early in s6, and we saw various changes being made throughout Wrath during the seasons-heck, even early in S9, we saw SOME balancing. But since the end of S9, it looks like they've pretty much given up.
They left frost DKs in a stupid state until the end of the season, they threw half a bandaid on the MMR problem by hiding them from players (which didn't fix the problem), and they changed unheeded warning. That's about it. Between the MMR problems, resto shaman/lock, feral druids, and casters in general, S10 is a giant mess, and they haven't even come out and said "yeah-we get it-we'll do something about it 'soon.'" We got a blue post in the PvP forum to give us the impression they care, but that's it.
S10 is probably Blizzard's most apathetic yet. It appears Blizzard has just gone into "salvage" mode. They know the game is hemorrhaging customers, and they're seemingly trying to keep as many players around as they can with the least amount of effort. They know Diablo III will be big. They've certainly got a lot of resources dedicated to "Titan." And I the next xpac is slated for next year, so I would imagine a lot of resources are already dedicated to the expansion (given the Blizzcon is just a few months off). Before you know it, we'll be in beta AGAIN.
tl;dr-Blizzard knows there are balance problems, but I suspect the only time we'll see balance changes from here on out are in 4.3. After that, we may see some bug fix or PvE balance patches, but, assuming they're set to follow their expansion timeline, many resources are probably already dedicated to the next x-pac-so GG S10 and 11.
I still have fun playing with friends, going back and soloing old content, and playing a new toon every now and then, but I think that's the most we can expect from the game at this point-new dragons and nostalgia.