OP: BLM is very powerful, on both single target and grouped targets. It seems SE intended for the jobs with single target limit breaks to be better DPS for single targets.

And it's nice that you think the best way to play Monk is with rear/flank dance, why don't you level up Monk and find out for yourself which is better, instead of assuming you know what is best for a job you don't play? Personally, I have tested both and get much better results with flank rotation. Guess that makes me a bad Monk?