nobody cleared a goddamn thing in t5 gear
the top raiders on earth cleared naxx with SOME sunwell gear. naxx was an easy raid, a rehash and wasn't meant to be a challenge in any sense of the word. it was a time-buyer while they worked on hardmodes in ulduar.
they want the game to scale linearly 60-90 like it does 1-60,
a single formula for all gear/mobs/bosses/etc. that means your level 90 heroic mode gear would be better htan the shit you get at 94 because you killed 8 rabbits for Farmer Dingdong