The thing you have to keep in mind in whether or not to spec Kings is that if, during a progression boss fight, you have a good balance between your EH and your avoidance, you will pretty much always be taking enough of a hit to your huge HP pool, that the 10% of your heals that feeds SA will keep your tiny little Mana pool more toward the full side, even if you are judging Light.
-And 10% more EH makes your healers <3 you.
-And 10% more primary DPS stats for your DPS makes DPS fights like Gorefiend go smoother.
-And being able to pick up the slack when your guild's only raid-worthy Ret Pally is taking time away from WoW to deal with the fact that you killed his dog makes your Raid Leader <3 you. (Even though you killed his brother's dog)
See where I'm going with this? It's good for Maintankadins to spec Kings. You don't sacrifice much, and you'll be giving your Raid Leader an excuse to not take the Guild Master's wife's Ret Pally that just dinged 80 ten minutes ago and is clad in all quest greens to Naxx10.
I'm not the most experienced maintankadin in the world. In fact my experience past t4 and ZA is measly. But it's clear even to me that in circumstances where you only have to single target tank a level ?? (Boss) Really Really Big Mob, not having the option to boost your EH by %10, should you be the only Pally in the raid because you opted to take soloing or PvP talents makes Baby Jesus cry.
That is all.
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