I honestly think that just minor changes would do. The problem is that there are a plethora of minor "problems" with the job and it adds up.

Minor changes such as :

- Putting Dark Passenger back to its 3.X state, essentially halving its MP cost while raising its base potency to 150 and DA potency to 250
- Making Dark Mind reduce all damage instead of just magic, while raising the recast time to 90s if too powerful
- Reducing Shadow Wall's recast time and maybe giving it a little extra effect, like for example a small MP regain when hit just like Blood Price, with the same potency benefit as Vengeance's counter attack effect
- Shortening Plunge's animation-lock and increasing its range to make it on par with the other gap-closers and maybe give us the ability to double-weave it
- Remove the Grit requirement on Souleater's lifesteal, or atleast give us half the lifesteal when Gritless instead of just removing it completely

All of the above are really minor when you think about it. It's no major rework or anything, just some tweaking to some lackluster skills without altering their function.

The only "bigger" change I'd like to see would be reintroducing Scourge as a second Syphon Strike combo finisher with maybe an extra effect attached to it so that it's not a complete copy of Goring Blade (like a lifesteal on each DoT tick). This simple change on top of putting back Dark Passenger to its 3.X state could cover the DPS issues that DRK currently has if they balance the potency well. The mitigation and self-sustain issues would be covered with the Shadow Wall, Dark Mind and Gritless Souleater changes above, and the raid utility (if they need to add raid utility to the job after these changes) could easily be put on Sole Survivor. Like some debuff that could benefit the group. Nothing too overpowered, but useful stuff.

Such changes wouldn't be that hard to implement at all in a simple patch, especially when you see all the other job changes that happened between 4.0's release and 4.1. It's not expansion-level rework.

I'm really starting to believe that they just outright hate DRK. They just don't seem to care about this job at all, like they just put it in the game in HW for marketting because it looks cool as hell and it's a fan-favourite job in the whole FF franchise, but they don't really like it at all.