Do you aim for hit cap?

Voted the 5th option since I can't care much of that.
I have ~100 atm, I just don't know where it comes from
This being said, AS sometime miss but it doesn't cause a wipe.
Health or avoidance may sometime, so I do focus more on them.

I keep hit gear specifically for 4h.

it only doesn't miss if you glyph it if you are at the melee (not spell) hit cap. I have the glyph and have had it miss.

Failure due to mechanics=/=miss
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Not so much miss, since there's so much on gear anyway, but oh sweet jesus I would sell my soul for more expertise. I elixir it, I food it, I try to use pieces with it, and it's still not enough to stop me seeing PARRY DODGE PARRY PARRY and fuck my threat for the first 20 seconds of a fight.
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Levantine: Frost Tank
Anzen: Restogoat
Popeadin: Retardin

Seems like most upgrades gimp me somewhere, usually Hit.
The only thing I can do atm is switch one ring. I lose effective health from armor but I gain hit rating. Thats something that I would normally never do but since I dropped below 200 Im willing to get back to 200+ by losing some EH.
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Supposedly RD still operates on the spell hit table which means that the glyph should bring it not to unresistable, but to the same cap as melee hit.

However, I've never seen it miss once with the glyph...
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Gladiator Psiven, 80 Tankadin
Bloodsail Admiral Psivenia, 70 Warrior
70 Belfadin, 62 Druid, 60 Priest, 60 Warlock
Longtime addict of Space - Glory Through Conquest

why would I actively pursue a stat to increase threat when no one can pull off of me anyway?

It feels like the evolution of raid battles has gone like this:

Vanilla: If healers don't go OOM you will nearly always win. What's DPS? (see Onyxia)

BC: DPS is now a big issue, because if you don't kill fast enough, healers go OOM. Maxing out threat is extremely important because DPS is chomping at your heels. (see Gruul and Voidwalker)

WotLK: Threat is no longer issue, but DPS/healer mana still is. Therefore, max your DPS and you still probably won't even have to worry about agro. Just worry about that enrage timer. (See most any WotLK fight)
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[url http://armory.worldofwarcraft.com/character-sheet.xml?r=Uther&n=Brute /url]

If you want more threat, Str is the way to do it NOT hit/expertise. Str is much better than either stat, AND adds mitigation through BV.

If you want guaranteed pick-up abilities, then hit might be what you are looking for though.