Blizz might have a little trouble with this, as there is damage intake between your average lvl 100 mob in Nagrand and raid bosses. I know many people don't focus on that middle ground, but I've found that bears struggle in that zone of damage intake when you're taking decent damage but Resolve is low or not kicking in. It's similar to how Vengeance and FR worked in SoO if you went between 10man normal and 25man heroic (or even 10man heroic) on the same boss, the way bears used abilities and reacted to damage drastically changes because of Vengeance scaling. That "issue" doesn't really disappear with Resolve, although perhaps dampening down on Resolve equalizes the experience and makes our choices more gear-dependent.
I suppose, simply stated, it's an overall clash between stats balancing, gear scaling, and keeping control on Resolve. At the very low and high extremes, bears may seem powerful in certain aspects, but the middle ground is a completely different story. I would hazard a guess that most bears likely operate at the low/middle ground, so the solution would likely have to be elevating the middle ground while not completely turning high ground bears into god-mode tanks.