I think the moderators are doing an excellent job entirely on the Convergence meta.
My honest opinion is that every stall-wall team player always wants to ban something that clearly is a counter to their style of play. Gourging Fire is the perfect counter to that boring set of Chansey-Skarmory, which is getting very old already. Hyper-offensive is a style and one made up intentionally to counter stall-wall strategies.
Plus, I don't see any problem in it. For Gourging to be THAT strong, he needs at least 2 DDs. You can stop it from dancing twice or use Unaware/Clear Smog/Haze. The poor guy doesn't have any other Fire/Dragon Pokemon to exchange abilities and moves with and you still want to ban him? He is not broken, just as Baxcalibur and Belly Drum are not.
I have an Unaware Cresselia with Haze in my team, no Belly Drum mon ever got to hit me with a 4x... EVER! Just use counters.
The most annoying broken things are the hyper-defensive walls. They exploit a lot of this meta, way more than offensive mons. We have Regenerator Assault Vest Suicunes walking around Flip Turning to a Rocky Helmet Defensive Walls all the time... There MUST be some mons available to counter this.
About the Kyurem... I have just faced one against my Sheer Force Regice in Snow... He didn't have Iron Head, probably Scale, SD, Glaive and Earthquake/Icicle Crash. I've survived a 2x Attack Glaive Rush and Moonblasted him to death.
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Besides, I can think of many other counters to him: the classic Unaware, Earth Eater Steel types, Body Press Skarmory, Prankster mons setting Rain to a Swift Swim Water-type, Sashed mons with Haze/Clear Smog... The list is infinite.
Convergence is being very nice exactly because of that... It is not totally filled with hyper-defensive sets because some hyper-offensive ones can exist.
There are many sets Thunder Waving, using Toxic and switching endlessly until the game ends, just like Sneasler, that were banned just because of her Toxic Chain / Dire Claw, when a simple scarfed Pokemon with Psychic, Earthquake or Brave Bird could OHKO her.
I do get it that there are people that enjoy more using hyper-defensive teams, but lots of players have these wild ideas exactly to counter these teams... And when it finally catches up, the solution cannot be "ban", should be to adapt. That's my humble opinion.