Originally Posted by Sepulture
I did some searching and didn't see the theorycraft that backs that assertion up, and it's news to me (or the reasons for the specificity to TBC bosses).
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See:
Curse of Weakness
Short of the thread is that far as we can tell through Beast Lore on mobs succeptible to that skill, no beast currently in the game - regular mobs, L70 elites and up to and The Lurker Below - has their damage further reduced after a ~320 AP reduction. The current working theory is that mobs simply don't have more AP than that.
This basically means that Improved Demoralising Shout is only of real use when you Curse of Recklessness the mob. 'course, given that you should CoR the mob in most situations, this means that IDS is still quite useful. Just not as good as it looks like.
On Shield Mastery improving Shield Slam; yes, it and 1h speck both actually. The latter is a 10% increase to every damaging attack you do with a 1h weapon equipped, including things done with a shield. They conspire to add a good 43% more threat to each Block Value compared to the baseline .169 TPS/BV I calculated last page, putting us at .242 TPS/BV. You still need about 33 BV for a 1% threat increase and it's still worse than hit or skill on a per itembudget basis, but I do agree that it's certainly much more obtainable on decent tankgear. My intention was more reacting to the blanket statement that BV was the "best" stat for threat more than making a serious case for chosing gear.
That said, I do think hit is relevant for sockets. Rigid Dawnstones are at the very least useful and possibly optimal for those backup Vambracers of Courage and Iron Gauntlets of the Maiden you've replaced with other pieces as primary tanking gear but use as threat gear thanks to their BV.