You are trolling if you are not using essences and actions in Delubrum

[Seraphor]

I've never gone out of my way to grind or buy fragments for essences or lost actions, and I have a huge supply of Essence of the Martialist, which is all you ever need as a tank. So I don't really think there's much excuse for not having something.
Sure there are some essences I'm running low on, I wish I had more Deep Bloodsucker to make soloing Zadnor a bit easier, but that's not necessary for DR.
I'm not sure what it's like for DPS/Healers because I always queue as tank (the one time I queued as MCH, there were no tanks in the instance...) but I'm sure there must be something relatively common that will be useful.

It makes a notable difference when nobody in the instance is using an essence, all those +40-70% damage buffs really add up, and can turn a fun 30 minute raid into a 60 minute chore.