Should Dark Knight get a Rework?

[Jeeqbit]

Even at the fastest possible post rework DRK speeds (specifcally, max Haste Bozja gear), it can drop your GCDs down to 2.10~ if I recall

That's about right. You could manage a GCD of around 2.11 with Skill Speed at level 80, but that's with end-of-expansion stat growth, food and using gear with the highest Skill Speed even if it's a lower item level (or scaling it down from 90 now that Endwalker exists). I personally couldn't enjoy DRK without stacking it in Shadowbringers. Over a long period of time, not stacking it just made me want to switch to something else, which I did anyway because Paladin was on the poster.

that'll probably have it's value lessened by a drastically inferior critical hit stat (being that it is rate+damage), and no direct hit.

Skill Speed effectively increases crit rate but not crit strength, by increasing the number of GCDs and their associated chance to crit. You can still stack crit along with it too. You just lose out on the benefit from Determination and Direct Hit in exchange for the potency gains of extra GCDs, dot and auto potency, and entirely lose out with aoe and Unmend.

And as you said the raid buff windows that promote the need for multiplicative stats and expect a rotation to be perfectly aligned into a 2 minute window make this sort of choice even more penalizing.

But since this did increase my enjoyment of Dark Knight, maybe adding a haste mechanic would improve it. I haven't played it much in EW, so I'm not sure whether I like or dislike the new flow of the rotation. At first I didn't like it, but I think I just can't be certain how I feel about it unless I play it regularly again.