It seems the consensus is that the tank changes primarily affected the end-game raiders - the ones who try to maximize dps while tanking. Unfortunate as it is, the fact of the matter is that tanks are not damage dealers. They hold enmity and cycle between their defensive skills, depending on the situation, so they don't give healers a hard time. Healers already have their hands full handling the squishy dps - they don't need another headache from a war who tanks in deliverance 100% of the time, or a drk who refuses to turn on grit.

I'm a very casual tank player. I did end game raids (extreme/savage) in ARR and HW, but I was always the kind of tank who prioritized staying alive (and holding enmity, of course) over dealing as much damage as I can. To the tanks who want to go above and beyond, cool, but note that your dps is peanuts in the grand scheme of things. You'll end the encounter, maybe a couple of minutes faster. Big deal.