Problem is while other jobs need low/ medium effort, DRK needs high effort to perform close yet not better than those. Add that its really lacking a personality and niche, and players say "Why pick Drk when X tank is easier and performs far better on low/average skill cap and even on high skill cap they are still behind even if not for much?"

Some people might enjoy DRK, buts thats like those who mained Pala on Heavensward when they were on a serious need of some love because Drk/War were outperforming Pala badly