On the subject of tanks turning the boss away - while I know a lot of people don't play tanks personally and so probably not a lot of players know this, almost every boss in the game has a front cleave by default. It's just as much the responsibility of the tank to keep a boss faced away as it is that of the rest of the players not to stand in dangerous areas in the first place. Y'know, just like every other AoE.

If the players decided "oh yeah let's stand next to the tank", that's not the tank's fault.