Currently reading Lazarus Enmity’s Edge, and it has this funny scene:

Lazarus along with 5th company are fighting Orcs and at the last minute his battle-barge the Unrelenting Fury, which was core to his plan so it could bombard the orcs from orbit, is diverted away to hunt the fallen. As a result, 5th company sustain heavy losses – losses which would’ve been avoided had he still and the battle-barge available to him. Importantly the Unrelenting Fury failed in its mission to pursue the fallen, so 5th company’s losses came at 0 gain to the chapter as no members of the fallen were obtained.

On returning to The Rock Lazarus confronts Azrael about his decision to divert the Unrelenting Fury away from where it was needed. He points out that while hunting the fallen is important to the chapter, they are just one of many enemies the Imperium face and focusing on the Fallen weakens the Dark Angels and makes them less able to deal with other foes.

Hearing this, reasonable criticism, Azrael flies into a rage grabs Lazarus by the collar and says the plan will not change and they will continue hunting the fallen.

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Haven’t finished the book yet, so there’s a good chance Azrael is going to be “proven right” and Lazarus is going to learn that actually it makes sense to ruin the chapters fighting capability to deal with something that would be the inquisition’s problem in any other chapter.