I've been using Shield Block Value as my primary threat stat on my armor. As time has gone on, without really realizing it, I've been moving to a more hit/expertise system which relies less on big shield slams and more on consistent white damage and specials that don't miss and are not dodged or parried. While this has been occurring, armor with higher dodge rating has been steadily dropping, meaning that my avoidance goes up and my rage generation is more and more dependent on not missing or being dodged or parried. T5 content, with the reliance on SBV, allowed me to stack stamina and block value in a way that T6 content does not. I've dropped my block value from around 800 to a little more than 600 lately, while looking to increase my hit and dodge for bosses like Azgalor, who doesn't crush. (He's a nice little preview of the future in that regard.)
My point is two fold: one, especially for a warrior (be he a tank or DPS, I'm just using tanking as my example because it's what I primarily do) gear obsolescence is constant. You're always changing and upgrading your gear as you go through content. (This is true for just about every class, mind you, but I'm talking to warriors.) Furthermore, however, you also become a bit of a packrat, holding on to outdated gear because it has a stat that may be desirable for a specific fight. I still use The Sun Eater if I feel dodge is absolutely essential for a fight, despite having overall better weapons now.