Originally Posted by
Allyrion
Dragon Kick is MNK's main utility, Mantra is secondary. It lowers the Boss's INT by 10% and is made to be a constant debuff.
It's like a permanent mini-Supervirus (the super virus trait lowers int by 15%) and, of course, stacks with Supervirus.
This is beneficial for any fight with magic damage. Similarly, Rage of Halone from the PLD reduces STR by 10% and is the counterpart to DK.
Dragon Kick's utility is usually overlooked cause it's built into our rotation and mainly functions to increase our damage.
However, it plays a larger utility role than, say, Mantra since it's a permanent debuff to the boss.