The top speedrun already indicates DRK being lowest DPS of the 3, doubt the 20pot increase does anything. But that also is attributed to the lack of mechanic movements and downtimes for the 2 Primal EXs.

There needs to be more variables in the instance design if SE wants to keep the tanks as is. I would take having to do multiple jobs than having the best 2 jobs dominating the role. Like for example, you need AOE you will want to bring DRK as the prime. You need a lot of defensive CDs to sustain high dps, you take WAR. The fight has a lot of downtimes, take DRK. High uptime less movement, take PLD.

At this rate WAR and PLD are instalocked on high uptime instances.