Looking at each job individually, there are variations in what they are good at and what they are not so good at. (This would be the aspect known as job characteristics.)
These variations are altered through the addition of equipment/items and through job adjustments, and linked to the compatibility of content. Furthermore this is linked to the variations within a job itself.
These variations are a matter of degrees and will become a topic of where we draw the line; however, there are various methods to perform adjustments.
For example:
Adjustments to jobs
Adjustments to equipment and items
Adjustments to content
So on and so forth…
With that said, we feel that currently dark knight’s level of variation is much higher than that of other jobs, and since it seems that you share the same understanding we have come to the decision to revamp the stats on Twilight Scythe.