Dark Knight was bad even in Endwalker but

[CKNovel]

Dark Knight is busier than GNB in terms of oGCDs right now, optimal rotations have DRK double weaving 5 times to GNB's 2 times.
GNB is more about fitting a load of GCDs into a small window now, which I personally find less "busy" and more of "better have the right skill-speed"

And if your response to this is "what about MIT", DRK is going to be pressing more mitigation than GNB on average due to Oblation and Dark Mind. And DRK doesnt have 20s mitigations to mit in advance like Camouflage.
At Burst windows anyway, at the 1m mark DRK isn't going to be double weaving at all. Which is definitely a design decision made by Creative Studio 3

GNB goes around 39~40 CPM, DRK 37~38, that is including mitigation.
In EW, GNB was around 43, DRK 40.5