What? That's not small, that's like having another player if you make 3 frost mages spec arcane instead.
Not to mention how, if we accept your premise, then every aspect of the entire game is horribly poorly designed on such a level that the differences between specs in PGs is small by comparison, in which case you really should be busy complaining about those far more important things instead.
"Why make trillions when we could make... billions??"
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It's a pointless.
Also, you missed the point: raids are designed such that the deltas are small. PG is designed such that the deltas are large. There's not much that can be done to change this, hence why it fails for me.
I did my first round of proving grounds on my Resto Shaman last night.
Bronze was face roll.
Silver felt a bit like one of the easier cata heroics.
Gold is pretty tough (got to wave 7 on my 5th go) need to use your CDs and Interrupt/Grounding Totem etc need to actually pay attention.
I think its a lot of fun!
I am not interested to regem and reforge just to get gold in there. If you want to make it better, put free gems, enchants and other stuff that you can use just for that and put everything back the way it was on exit.
Ideally you'd just get a 'Wardrobe' which you can pick a set of gear from (think GW2 PvP) that only works in the PG instance. That rules out weird scaling issues (like lots of sockets/socket bonuses, unless this has changed?) and puts everyone on an even playing field. You could have a set which favors each secondary stat and hit/expertise is just set to cap.
I don't think Proving grounds is/should be a way of teaching people how to play a class. It should just be proving how good you are at playing a particular class and comparing that against other players of the same spec.
As a disc priest in 530+ gear, I would have to regem, reforge and bring along new trinkets just to perform adequately at 463 ilevel.
I can't be arsed to do that; and so I cannot beat Gold 8 without running completely out of Mana.
For pure pugging, I think Proving Grounds are truly worth their weight in gold
I would never ever get a pug for even Flex that doesn't have PG Gold for his/her spec - it pretty much guarantees that you can basically play your class at whatever ilvl, which I think is a great measuring stick to have.
I haven't tried Endless yet, mostly due to the fact that I find it boring. But I did run through it on my main for the DPS Gold just to know about it and have it. As a raidleader I would definitely use it as a criterium for recruitment.
That's why Proving Grounds are a great success. It's a reality check for people who thought so high of themselves but now they fail in there. It's like a slap in the face because you can't be carried by friends or gear. I thought I'm good on my tank char but when I started to struggle on endless it made me research, redefine my ability usage, talents, reforges, try out different styles and stats priority, then after all I got to 40th wave (when at the start I couldnt get to 10th). If you want to be succesful there you need to quit your 'it's everythings else fault' mentality and try to improve. And I don't only adress that to the guy I qouted but to everyone who think they are better than they really are and don't want to face the truth and improve.
Although it sounds like the discussion isn't so much about how YOU can get gold, but more about how certain specs and classes have an easier time with PG than others? Which is true, of course. But that's the same with pretty much all content. Questing, raiding, dungeons, PVP, Brawler's Guild, etc. All of these can be done with any Mage specs but for obvious reasons some specs will have a tougher time completing the content. It can still be done, just takes more effort.
It's not a big deal. It could be fun, even.
Its great but i don´t like the idea that i need to roll alts and learn to play em in order to get the achievements done.