Multiple outlets for completion is no issue as long as it follows the rules of the game. Using out of bounds as a primary boss kill or using LOS that completely negates the mechanics of the boss fight break the rules of the game we are playing in. Sure the devs could have put multiple ways of beating the raid bosses that challenged players to use new strategy but the most recent and previous iterations of player "creativity" only showed players ability to break rules. Not be creative and use different skill sets to overcome the actual fights as designed.