The Monk Temple

[enil]

A Dragoon HAS to attack from behind at least once every 30sec to get one dot up and the piercing debuff up on the boss.

A Monk loses way more potential dps if they do not reposition for their skills. I'm assuming you are talking about the Impulse Drive -> Disembowel -> Chaos Thrust combo.

Dragoon does not have to attack from behind with Impulse Drive. You lose 80 potency every 30 seconds but if you compare to a Monk who doesn't move from the side.
1. Bootshine automatic crit. Depending on your current crit rate, this is a potency loss of 50-60 per use. You will be using this every second rotation unless you have someone putting on the dragonkick buff. Then you'll be using is every rotation. Assuming a rotation every 10 seconds thats 100 - 150 potency loss.
2. Impulse drive. Some monks slot this in if we can do it without loses any of our buff/debuffs. That's 80 potency per use.
3. 5% crit on true strike. Not a big deal.