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As a previous poster said for Prot paladins at least 15% expertise is viable due to the way the active mitigation ability "Shield of the Righteous" works.
Instead of overwriting the previous buff the next Shield of the Righteous adds to the duration of a buff already in effect.
As a result minimizing or eliminating the chances of missing or not connecting with the SotR that applies the physical mitigation buff can give Paladins an extended period of mitigating 47% of physical damage in my level 90 Paladin's case.
TLDR: For Paladins it's looking like hard capping 15% expertise is a good reforging strategy.
For other tanks you have to find a reliable theory-crafter to give class specific information.
That's true, but it's not the point. The point is that a missed (or parried, or dodged) shield slam is going to be hard on your durability.
Nope. Devastate has to land to proc SnB.
In a choice between pressing Devastate for a 15% chance at 25 rage, or pressing Revenge for 15 rage, it's gonna be Revenge every time.
This is kind of a silly thing to say given that a shield slam is only 1/3rd the rage you need for shield block. A missed shield slam hurts REALLY REALLY bad.
If you're single-tanking something, you can only get 66% uptime on Shield Block anyway. Getting 60 rage in nine seconds, even with a missed Shield Slam, isn't difficult. If you hit a really dry stretch, you have Shout and Berserker Rage.
If you're tank swapping, you have downtime to pool your rage and it's even less of an issue.
Where expertise and hit affect your play most is your chance to bleed extra rage into Shield Barrier in addition to keeping up Shield Block.
A missed shield slam does hurt your survivability, yeah, but if you're using shield block regularlyish anyway, more mastery will give you more rage from critical blocks, and even if you're not, more parry will increase your revenge procs and while you still need hit/exp to land revenge, having it proc more is going to increase your rage intake more than hit/exp.
Combat tables, diminishing returns and you!
Hit and expertise will give a much more steady rage generation, but crit could give more. I <3 hit/expertise caps, but I don't bother getting expertise hard cap specifically because crit is so damn good.
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