The one thing I must make abundantly clear is that if you have just hit Level 50 and are still learning to Tank, go Mitigation.
Maybe for end game content? Otherwise I highly disagree. STR should be a stat you are entirely focused on even if you are learning. If anything having a heavy reliance on STR will just teach you to be better and smarter with your cooldowns and overall make you a better player. A Sword is forged through fire. I can agree that while progressing content you should give up STR in favor for VIT (Until you know how much VIT you need to survive), but that is progressing challenging content - Which for our example would be FCoB.


1. You want to produce more threat. Threat should never be an issue against similarly geared DPS for even a Mitigation Tank. One should be able to keep threat against even a DPS with a weapon 20 iLvls higher than yours. If you feel that you need more Strength to keep threat, you probably aren't skilled enough with your job to Strength Tank.
Snap threat is extremely important and having more strength will help you out. You will find yourself often paired with really good DPS and if you aren't putting out enough damage you will potentially lose threat. I have done T8's on my ninja where I have lost aggro to a PLD who did everything right but was VIT based. STR is huge for aggro management and just makes things a whole lot easier. This IS a good reason to stack strength.

Healer DPS
Tanks focusing on STR almost never reduce a healers DPS. You completely overvalue Vitality as a stat.

Also Parry isn't a bad thing, the Parry stat just scales incredibly bad.