DEV Request: Please do not make DRK a 1-2-3 like PLD was

[Crater]

2 and 3 are functionally the same, but 2 is slightly worse because of no free self-healing(in grit). DRK has gotten clunkier, not more complex.

2 is better if Trick Attack, Balance, Chain Stratagem, Battle Litany, Embolden, Brotherhood (and so on, I'm probably missing a couple) will be up on the second GCD of your combo, and down by the third.
2 is also better if you're sitting at a high enough MP level that Syphon Strike will bring you past 100% of your MP bar if you don't blow some of your MP away on Dark Arts.

The number of times that these scenarios happen (and their usefulness overall) far, far outweighs the nearly-nonexistent benefits of a 420 potency (plus the Grit penalty) heal that you only get in a stance that you almost never want to actually be in during a single-target scenario.

[Reynhart]

The number of times that these scenarios happen (and their usefulness overall) far, far outweighs the nearly-nonexistent benefits of a 420 potency (plus the Grit penalty) heal that you only get in a stance that you almost never want to actually be in during a single-target scenario.

If any of those buffs are active during only a couple GCD, then you don't spend DA on SS, but on Bloodspiller, or preemptively on BN to cram a second Bloodspiller in.
And it's pretty early to judge the value of Grit and self-healing when we have no idea how much damage we'll receive in Stormblood.