Originally Posted by Sarlunas
I don't see how this changes things much at all. Even at 12% it will still be a dps gain for almost any 10-man setup. If anything, the lower value makes it even more annoying to be forced to keep it up. The change seems more aimed at 10-man groups without a Warrior or Rogue.
I wouldn't be surprised to see new talents and/or glyphs that allow us to keep up EA without impacting our normal playstyle as much, perhaps in the vein of CttC. At just 12% the PvP implications would be small.
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Sigh, so after an hour or two of number crunching I have disproved my own supposition and I concede the point. In order for it to be a rDPS loss for me to run EA (at 12%) my poison damage from the Envenom buff has to work out to about 300dps and I need to be the only physical dps since tank dps is enough to over shoot the dps loss I take (for feral tanks in particular).
I've included my work for your amusement since I firmly believe in showing that I spent more than a few minutes working on this only to determine that I am completely incorrect.
Premises:
1) We ignore the bonus damage my poisons do during the envenom debuff
2) We ignore TotT trading that artificially boosts my Envenom dps
3) All dps numbers are calculated without the ICC zone buff
4) This only applies to Mutilate rogues since, for combat rogues, the loss of the Major Armor debuff is considerably worse.
According to Aldriana's spreadsheet, my theoretical dps (as mutilate) is 11,766.5. If I turn off the major armor debuff, it drops to 11,306.8 (for a dps loss of 459.7). Now if we mutiply that number by .6 (snice 12% is 60% of 20%) we get a new dps loss of 275.82.
So now the question is, what is the oppurtunity cost of my running EA during that time period?
World of Logs - Real Time Raid Analysis
That's my most recent Saurfang parse. Using it for baseline (and dividing all my dps numbers by 1.1 to eliminate the Zone buff) we see that I performed Envenom 25 times over 172 seconds. My average envenom was for 12,727 damage over that time period.
Now assuming I replace as many envenoms as I have to to keep EA up, we can estimate that I have to EA 7 times over the course of the fight (24-30 secs each at 4-5 cps). Seven envenoms would generate 89,089 damage which is 517.96 dps over the course of the fight.
Conclusion:
EA (20%) is a 58.26 dps loss over envenom in that fight
EA (12%) is a 242.14 dps loss compared to envenom.
Overall conclusion, even in that ICC10man group I was in with all caster dps and a feral tank (and Prot) it's still a rDPS gain to run EA at our current gear levels even with the new reduced EA incoming. Therefore I was wrong and the original poster is correct.