Isn't it just about a preference of playstyle as well?
To be honest theorycrafting points out that there is very little "wrong" with a DK tank that might gear and gem for passive tanking (prioritizing stamina/dodge/parry) in contrast to one that might gear and gem for active tanking (prioritizing mastery). Sure, the passive tanking route might be not as optimal for some fights, but it stands out as being better for certain others.
A passive geared DK will still have the same heals as the active one, just his blood shields won't be as big. Yet they'll have a longer uptime on Bone and Blood shield. And they generally will be better for tanking fights where most of the damage is magic damage, due to a bigger healthpool and less "stats" wasted on improving blood shield which is useless against magic damage.
In my "passive" gear I have the following stats:
- 230k hp unbuffed.
- 47% dodge/parry/miss chance
- 126% blood shields
In my "active tanking" gear I have:
- 200k hp unbuffed.
- 40% dodge/parry/miss chance
- 180% blood shields
I keep on being more inclined in seeing my (stamina/parry/dodge) gear & gemming as being better than the mastery stacking. But I might just be looking at it with old-school glasses.

MMO-Champion
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