The Definitive Dark Knight Guide

[Freyyy]

[...] because it reduces distance the boss travels to the party at the start, resulting in a longer distance for the dps to travel to reach their target which translates into a lowered raid-wide dps

wat ? Every single melee DPS in this game has a gap closer, DRG can Elusive Jump in right when Unmend reaches the boss, MNK can Shoulder Tackle, and NIN has Shukuchi... And if you don't use these tools, you can still run in at the same time as the MT instead of waiting for him, that way you're at melee range right on time and you may lose what... 0.2 sec of DPS maybe ? Which is nothing... I've never seen any discussion about this, it's just plain silly.

The only scenario where using Plunge on pull is a bad thing is when you want to tank the boss at a specific spot, like the center of the room, so you want to wait for the boss to move a little after your Unmend, so you won't Plunge. But these scenarios are very rare.

Edit : I don't know about Midas. I stopped playing the game in december (it was before 3.2 for the reminder) and came back in July, so I still haven't entered savage Midas, I'm just getting some gear waiting for 3.4. But I've done savage Gordias pre-3.2 and everyone was using Plunge after Unmend back in the days, and it didn't hurt anyone. The argument about the melee DPS losing DPS because of it is just complete BS. The ONLY thing that Plunge has an influence on is the boss's position afterwards.