Making the most of Tornado Kick
At only 330 potency, Tornado Kick stands to lower DPS if your timing is not perfect.
Bootshine and True Strike together deal 340 potency (over 400 potency when Bootshine is positioned correctly). In other words, if a target lives longer than 4 seconds after Tornado Kick is used, MNK suffers a significant DPS loss--a loss that compounds itself by sacrificing GL. Moreover, MNK is not likely to expend buffs (BfB/IR) on Tornado Kick for its intended purpose since you would not waste buffs on a target that's about to die or disappear.
If you strike with Tornado Kick too late, you risk missing the target, dealing overkill damage or hitting an invulnerability shield. If you strike with Tornado Kick too early--that is, the target remains engaged for >4 seconds--you face a DPS loss. You wouldn't casually use Tornado Kick as an off-GCD skill either, because the loss of GL is too great.
So monks: what, exactly, is Tornado Kick good for? Is it supposed to be an unforgiving, ultra-precise attack for monk masters? Or is it too weak to be worthwhile?