Tank Mitigation vs Tank DPS.

[YojimboM]

This is completely false and i have already pointed out why.

Between tenacity and D-hit melds there is 1.6 percentage point difference in the damage multiplier, tank damage makes up for 9-11% of the total raid damage. This number will at best decrease the time needed to finish duty by maybe 0.16%, and because it is so random and unpredictable you could as well just deal as much damage as tenacity tank, since 1.6% damage increase on the rng driven stat is likely not going to happen all the time.

So what you are basically saying is, killing boss 0-0.16% faster is going to make it easier on healers than 4.3-5% mitigation increase, which is absurd statement. It wont be even noticed by a parser.

I have no idea where you're coming up with those DH numbers from, and you're entirely excluding crit for some reason. Tank BIS this tier have approx. 1300 DH, which is a 3.8% bonus, and around 3500 crit, which is a 14% bonus. Remember that damage stats stack multiplicatively on top of that. (http://theoryjerks.akhmorning.com/stats/crit/, http://theoryjerks.akhmorning.com/stats/dh/)

If you brought tenacity to absolutely maximum levels possible right now (3582), the damage and mitigation bonus would still only be 9.7%, not even close to the combined crit/DH bonus. At more realistic levels (around 2000), you can expect around 5% both ways like you said, almost three times less effective than crit alone. (http://theoryjerks.akhmorning.com/stats/ten/)

This isn't even beginning to go into other details, like the number of raid buffs that favor DH and crit (Battle Litany, Battle Voice, Chain Stratagem, etc). Overall, DH and crit are both much more effective than Tenacity. In short: everything you've said about the comparison in DPS increase is wrong.

Tenacity might be useful as a bleeding-edge prog stat currently, as I've heard of at least one E4S clear where a tank with 3000 tenacity saved a run with only 3k HP after mistiming a Shadow Wall, and even in that case it was due to a player mistake and not required. At absolute best, Tenacity is padding for progging where a tank might be expecting to mess something up. In any other case, using Tenacity is essentially preparing yourself for failure, because if it benefits you in any large amount it would ultimately be due to failed mechanics.