Just finished LFR and when we got to Norushen they have removed the orbs so you can't allocate your top DPS to get purified to beat the enrage it's chosen by random.
It took us 7 wipes to get good DPS to be purified I was matching the people with purify if not beating them on the wipes because they were only doing about 100k with the buff.
Since you can't chose the people getting the buff if the people AFKing or bad DPS or people who don't know their class etc get it not the top DPS then you're doomed to wipe unless your best players get the challenge early on.
Too 7 times to get the only 4 good DPS done early and by then the debuff was just carrying all the people doing 12k-33k dps.
Fight needs a serious redesign in LFR so that it's not RNG if you have competent players getting the purified buff.
Also I should point out that even with 4 people doing 200k+ dps we still only got the kill with 0 seconds on the enrage since most of the raid were sub 40k dps.