This is not Dark Knight's identity, it doesn't bolster or form a new one either, it over-complicates a job that only has very specific things that need to be altered to restore it's identity. You've no idea what you're talking about and it shows in that you suggested a bloody tank stance shouldn't increase enmity, which is the entire point of a tank stance. Furthermore, putting DP and Carve and Spit on the same Cooldown makes no sense even with your proposed changes as the two actions are completely unrelated to one another and serve entirely different functions.

Secondly, Dark Knight's identity as the speedy counter tank; as it was in Heavensward (with a GCD and APM that was only second to Ninja), is the identity they should be striving to restore. Not any of this... nonsensical garbage that literally spits int he face of the job as a whole.

Dark Knight currently suffers. It has deceptively low AoE DPS, and while it certainly is not Paladin, it is still much worse than Warrior's.
This is also wrong, extremely wrong.

Dark Knights have the ability to use TBN for Blood which gives use of Quietus, which restores MP, which under the affect of Blood Weapon will restore 800 MP per enemy hit, with Delirium up that's 21s of raw MP and Blood gain, which if one spams DA Abyssal you'll create a fountain of damage, MP and personal healing that frankly makes you damn near invincible if you have so much as even a single CD up. This is excluding using DADP to prevent over-capping MP as well as the blood you'll gain from Salted Earth being properly placed and ticking on all enemies.

WAR has inner release and can burst things down quickly, sure, but it terms of large pulls, DRK can handle them for much longer and far more effectively than the other two, hands down. One could even argue that Dark Knight and Warrior are comparable in terms of their performance in dungeons as both have unique kits that seem tailored around surviving big pulls while outputting exceptional AoE damage all the while. Just because you or someone else might not utilize the kit to the fullest doesn't mean they are bad, and there needs to be some accountability there.

Frankly, as a DRK main since 3.X, I don't want any of what you've listed; though props for not changing TBN.
Most Dark Knights you ask will tell you that we want a fast job with less reliance on Dark Arts and more of a focus on Blood.

Bloodspiller now deals it's damage normally for the first enemy, 10% less for the second, 20% less for the third, 30% less for the fourth, 40% less for the fifth, and 50% less for all remaining enemies.
Okay.... just noticed this... and like... uhhh... what?

You do realize that they only do diminishing returns for AoEs and Bloodspiller is single target, r-right?? Like, you're not getting it confused with Quietus are you? Because this would be like telling a Warrior "Heeeey your fifth Fell Cleave in Inner Release is going to have half of it's potency"

I can't... I am reading through more of your suggestions and they just... make me feel like you have no idea how the kit worked in 3.X or now. It's hard to really want to reply or comment on anything else, so I'll just leave it at this and bail out. You can reply, by all means, but I won't be coming back to read it. Felt it was courteous to say, since I really have no more input to give... these suggestions are just bad and I am at a loss for words. :/