Power creep is relevant, on my view, because what people tend to see in isolation is something like:
Wizard before - firebird for grift; now, tal rasha. So more boom less dot.
DH before - huge dps, in season 3 it's actually buffed higher with Nats and increased survivability.
But firebird and dh dps were incomparable before. And the dancing needed with Tal Rasha compared to other sets is still a joke. A well geared Raekor barb (so imagine last 'era' already) will still be able to clear faster than Tal Rasha, because the nature of a Tal Rasha wizard is to generate the falling meteors. Look at even someone like Reiko Zockt, his Tal Rasha 2.2 (from PTR). Compare that then to Shinobi's raekor barb (last era). That raekor barb will still be better.
I don't like the way that some people think that an action rpg like Diablo 3 should have a 'support class' a 'dps class' etc - this game is fundamentally about killing monsters fast, and all classes should be able to. The fact that zdps crusader/wd and 2 dh feature in top grifts proves this point. And on PTR the DHs I know were actually holding back on a lightning build, I think, so the Wizards that showed in the Grift 60 clear that garnered so much attention are something of a ruse.
My issue is with the fact that even with a wizard with 1.5m sheet dps, 120% fire damage, a further 45% elite damage, I get out-dpsed quite easily by other classes. So much so that zdps crusaders will leave a Wizard, DH, WD group stating 'wizard useless dps' etc.
I have only ever played a wizard as it is the class that appeals to me, and Tal Rasha's is a step in the right direction, but I took a look at a nice ancient kridershot yesterday - look at the way the skills synergize in the DH class - it is simply much better. And APOC has been nerfed like crazy for wizards for a long time now. Does a raekor barb (top gear) face all kinds of resource management issues? No. Even a firebird wizard does, hence why cindercoat becomes so valuable.
To keep up with fast farming T6 I switch to an ancient Aetherwalker - a significant dps loss, and teleport then costs a lot of mana as well. To add mobility to a wizard then, we have to use our weapon slot. I mean, come on.
I just wanted to promote some discussion of the classes here too. In terms of a suggestion - I know that Blizzard are not balancing the game on group rift progression - fine, but to me (even in 2.2) there is still such an amazing disparity between the classes.
Power creep is irrelevant.
You buff class A's damage output by 15%, you buff mob HP by 15% to compensate. Still takes you the same time to kill said mob. Both Diablo and World of Warcraft are balanced on the premise that power creep is inevitable. When there is no power creep, you get games like Final Fantasy Online where people are paying money for an expansion where there's nothing to upgrade to. What's the fun in that?
With that said, I, too, have a Firebird's wizard and ran into the same problem you did. That's when I realized that Blizzard balances sets/classes off of four premises:
1. Single target dps
2. AoE dps
3. Mobility
4. CC/Survivability
A Raekor's Barbarian has fantastic AoE damage, mobility, and CC, but when the final boss comes, suddenly Raekor's isn't so strong. A Marauder kitted Demon Hunter has fantastic single target and AoE damage output, but the fact that they're limited by the cooldown of the turrets makes their mobility suffer. Akkahn's Crusaders are well actually balanced in each of the four areas in my opinion, but I've never seen them keep up with my Raekor's Barbarian in the trash clearing area.
A Firebird kitted Wizard's problem (which is the problem you're facing) with Rift grinding is the simple fact that they have no mobility, and what I mean by that is that it takes some time for the full effect of a Wizard to see their full potential. Thankfully, from what I saw today, one of the issues you Wizards were having with Rift grinding was solved with the Tal Rasha's set, cause man, those meteors were falling and it was a beautiful site to see. He was doing so much damage.
Since the patch, I've been able to test out my Roland's Set and my Immortal Kings + Bul Kathos Blades sets.
Rolands = Ho-lee amazing single target damage, batman! I was using a Fire Sweep build, but the damage output was insane; highest I've ever seen imho. Every sweep (or shield bash) reduces the cooldown of your defensive, laws,
and Akarat's Champion. That last part isn't listed on the set, but it definitely makes it so you can have a very high up-time as long as you're fighting. Problem is, there's like zero mobility. Despite your dps, it'll take you forever to clear a zone.
Immortal Kings = I'm mixed on this one, because it feels like it's balanced around the Wrath of the Waste set, or at least Whirlwind in general. The Bul-Kathos Blades set increases your Fury generation by 10
per second, not by 10, so this allows pretty much for a permanent up-time of Whirlwind (resources are NOT a problem with this set). Combined with Dust Devils and you can do some pretty spectacular damage due to the fantastical train of tornadoes you create in yoru wake that all do good damage (the tornadoes now travel in the direction you were travelling when they were cast). Not to mention, the +30% attack speed while Whirlwinding makes it so your Wrath of the Berserker is up full time, because with +30% attack speed, you're spending resources +30% faster, which means you're resetting your Wrath of the Berserker cooldown 30% faster... you get the point here. It's a spectacular build. Without the Bul-Kathos set blades though, you need some hefty CDR to make it happen. Survivability is versatile depending on which Ancients you pick. Single target damage is okay. If you go with the Fire Ancients, then your single target is actually quite good. If you don't, then it suffers. With Slaughter going on my Wrath of the Berserker though and +39% physical damage, I clear Rifts faster than my Raekor's Barbarian easily with better single target damage output. Raekor's wins in the CC department though.
Wrath of the Wastes = I have 4 out of the 5 necessary pieces to get the 6-piece bonus (gogo RRoG!). Once I get my 5th piece, I'll let you all know.