I'm in the camp that the other tanks have too much self healing/sustain and should be more reliant on the healers - differing opinions, I know. But since they've taken things this direction already, might as well add better self sustain to DRK.
It would be nice if TBN break gave an option between a free AD, CS, and edge/flood of shadow. I like the way TBN works, which I know is a contentious topic, but it needs a little extra for it to be balanced.

But AD is useless as is and has been for a long time. If it was even half as effective as blood whetting I'd be happy. Just reading through the bloodwhetting description blows my mind - a barrier, a ridiculous heal, and a damage mit. HOC for GNB is similar with a 900 potency cure! AD has a single 200 potency ever 60 seconds .. .. .. .. It's bad

A regen when standing in salted earth is a good one Xeno called out in his video from another comment. <-- That is an absolute no brainer imo.

Someone mention a spread shield to pair with dark missionary, similar to sch adlo + deployment tactics, which sounds really nice.

but ya.. some acknowledgement from SE would be nice. No matter what they do, lots of people will hate it. I'd understand it if it had the best damage with the worst sustain, but they gave that to GNB and it still has amazing MITS. Astro needs an apology if this was intentional - I hear it was amazing before my time.