Some DRK changes seem annoyingly simple yet are ignored....

[Ramiee]

But I mean you do you, I just don't find a shield they likely don't even notice that can give me one oGCD attack to be less interesting then watching them heal themselves to full out of nowhere, which is potentially a sacrifice I made if I timed it poorly in the midst of the encounter.

You mean the thing that has killed healing on PLD and WAR. The thing healers loathe? What you described right here is why so many healers prefer TBN, because it doesn't erase their role.
TBN also uniquely has a sort of fail state for fight reclears, if you use it in the wrong places you lose out on a ogcd attack. Erasing the MP cost means you have to lose this attack otherwise it just becomes a chance based ogcd proc every 20 seconds or so, instead of a refund of damage as a reward for a well timed TBN.
TBN is by far the most interesting short CD on a tank.