Nerfing mob health and damage is more powerful then buffing players if you're looking at the average to below average player they want to advance through raids. Sure they could make Joe Casual 30% more powerful, but if he sucks with his rotation his damage output is still going to suck, just suck a little less, but maybe not suck less enough to kill the boss. Drop the boss health and damage, buff Joe casual with the inflated primary stats and he's taking less 30% less damage no matter what, so he can live longer and move the boss health starting point down 30% and you've improved a casual's chance for a kill.
It's like golf, give the average player a ball that may travel 30% further and maybe he hits the green cause he got an extra 20% distance despite his crappy swing, but move the tee 30 yards closer and he's on the green.
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