Tournaments are really different from ladder. He never has to play that Mage vs Hunter, unless he gets really screwed over and gets 2-0ed by a Hunter. Hunter is the strongest ladder class and Blizzard seems to be primarily balancing around ladder and, to a lesser degree, arena. Like, Mind Control at 8 wasn't a problem in constructed. All the pro guys said it was fine, you just had to play rush or bait the MC before playing your legendaries and in tournaments Priest had a lot of strong counter decks. The issue with MC was in arena, which is why most of the pro scene suggested making Holy Fire basic and switching it with MC. MC, as a rare, would be rare enough in arena to be a non-issue. Blizzard didn't like that so they just nerfed it.
The weird thing is the way they look at the data. They look at the win/loss stats "Oh, this class is winning too much vs this class, we need to change something." I mentioned this earlier, but they changed Buzzard the same patch they changed the original UTH because Hunter was winning to much vs Mage, so they made Buzzard 2/1 so it could be pinged off.... totally ignoring that Hunter OTK pretty much only played Buzzard the SAME TURN they killed Mage. Making it a 2/1 did nothing for that, and changing UTH at the same time made it a two variable experiment, which is silly.