Very interesting read, but I believe that you might have missed a point. The tanking meta actually hasn't changed so much, it's just that the content has become more difficult, thus forcing midcore raiders into adopting a hardcore style. Alexander savage is harder than coil. This is savage after all, the idea behind it is that you can only clear it if you go somehow beyond the boundaries of your job. The real big issue here in my opinion is that there's no midcore content currently, so those parties that engaged coil in a more casual way, taking their time, waiting for the next step of the relic weapon saga to finally beat that dps check have nothing to do except trying to do some savage only to find out that it is beyond their reach. But the "aggressive style tanking" has been a reality since the second coil at least, as well as the the hybrid dps/healer style for sch.