Why am I not seeing more shirk?

[Hruodig]

Only if the mobs are attacking you from the front, which has always been the case. The thing that made Raw + Awareness useful in dungeon content beforehand was the fact that it provided stacks. I know I made liberal use of it for faster Storm Cyclones and Decimates, which helped with AoE damage on mobs.

Like I said, it doesn't seem to have much of a use anymore outside of mitigating tank busters.

If you do big pulls, you will inevitably have some mobs hitting you from the side-hence where awareness still comes in use in dungeons, but not against trials/bosses. Sure it's not part of our dps rotation anymore, but no reason to not use it.