So unless im mistaken, there are no AoEs with positionals. So in big pulls it doesnt matter, because you should be using your AoEs. As for general combat, positionals arent as bad as you seem to think. Ideally you set yourself up at the border where the flank meets the rear position. You can then switch positions with a single step left or right. Need to dodge? If its a targetted ability then the other side of the boss(left versus right) will be out of the way a lot of the time because of how big bosses are. If its a point blank, you need to go out regardless(and if its a donut youre probly already close enough). And unlike a class with a casting time, you can move during the cycling of your GCD so those 2+ seconds will almost always be plenty of time to get where you need to go. You use the example of the plant boss in dohn mheg. What you dont consider is that you only need to be covering your tether when it gets snapshotted at the end of the cast. Doing one quick positional attack before moving to block wont cause this boss to fail.