Oookay, I read this over a few times to make sure there wasn't anything I'm missing ---
but it seems like the only confirmation of this is his 101 shaman losing specifically avoidance and mastery.
Since he pointed to mastery with no mention of the change they're doing, I think this is not a stat deflation in anything other than perhaps tertiary stats. Ele shaman's mastery scaling rate is going down, while the
damage the mastery does is going up. This is because at end game, they were capping mastery fairly quickly, and with the next ilvl spike, they'll have to start dodging stats which no one likes doing.
This is only happening to ele specifically, and only affects mastery specifically, which is what our friend noted.
So I don't think this is a "destroy all twinks" patch thankfully, I think our OP was just missing some important information.
Tertiary stats specifically seem to be getting a little squish though. Who knows.
Edit: (a little side note) Also, this is cause for rejoicing, fellow Ele twink, because mastery is a phenomenal stat for us, but we cap it out as 101s with just a few pieces of gear. Since the damage is being buffed, this is a direct buff to us, especially when using elemental blast. Awesome stuff! I have an 865 ele twink myself and was very happy when I saw the proposed changes. I hope my information helps you rest easy.