To answer the OP, not in the Heavensward leveling dungeons, but I do remember the trend a little after Brayflox HM came out. Honestly, I hated it. You'd only run into a few good tanks that could pull off gathering mobs and staying alive well enough for them to die. Others, they'll pull, not migitate, die in a few secs, then blame the dps for not downing quick enough (that was the time when it was all "whoever-seems-to-have-the-lower-dps's fault). I never understood it, and, if you ask me, I don't care how much you can pull, you're bad if you get us killed and drag on the dungeon time in the process.