Tenacity proven better? (BiS for tanks?) Gear Stat Calc

[aleph_null]

Well if we're going to compare Tenacity to other stats, we need to take both extremes.
Here's are the gears sets I'm referring to:
- Tenacity BiS: http://ffxiv.ariyala.com/11OWT
- Non Tenacity BiS (aka, avoid tenacity like the pest): http://ffxiv.ariyala.com/11OWO

Tenacity being the lowest DPS scaling stat, those 2 builds are the highest dps variance you can get and on those sets the overall trade off is ~1.5% DPS increase vs. ~5.5% mitigation.
Whether it's a good or bad trade off, that's everyone's personal decision but neither options make significant difference in anyway where one is "right", the other is "wrong".

DH is good, Tenacity is slightly less good for DPS.
There is no trash substats nor is there a king substat for tanks. Or you might as well call every substat garbage since they all scale within a tiny margin.
A truly garbage stat is spellspeed on RDM because 60% of your gcd's aren't affected by it. Tenacity is nowhere in that realm.

Eh no, it doesn't work like that. If you consider the mitigation of tenacity to be good enough to make it subjectively the best stat for you, then your "tenacity BiS" goal is to maximize it. If you meld dh because of its higher dps gain then your "BiS" goal is to maximize dps, which requires you to take into account all the secondary stats, even tenacity. Avoiding tenacity doesn't necessarily give you the highest dps set, at least for now we don't know yet. It's worse than dh/det/crit/sks but that doesn't mean every piece with tenacity is worse than pieces without tenacity. For example I'm not sure if det/ten would be worse than crit/sks considering how slow crit scales at current gear stats. As of now there's utterly no reason to build a set just for the sake of minimizing tenacity, unless maybe you're allergic to it somehow.

Also spell speed affects your gcd which means even your instant cast spells' gcd are reduced. The only non spell gcds rdm have are the melee combo and moulinet, these are the only ones that are completely unaffected by spell speed. I wouldn't say spell speed is garbage for rdm until I see some testing done to show that it scales much worse than other stats.