See now you're just getting bitter in your replies. But I'm sorry I just can't sit by and listen to you tunnelvision'd people who think that because you have a DPS SPEC it means you shouldn't be doing anything else but mindlessly spamming dps buttons. DS+DG is HUGE in helping mitigate raid damage, XT Hardmode Tantrum is one that comes to mind right off the bat, another is Hodir's Frozen Blows.
To the person that mentioned kitties going out of cat to heal, or Spriest, well cats have to to BR, do you tell them to not stop to BR because that cuts into their DPS? And yes we've had Spriests pop out of shadow to help heal if we lose a healer, it's all part and parcel to being a Hybrid Class.
Maybe I don't have the most uber heal team in my guild's raids to facilitate me not worrying about popping off with a few FoL's on the Tank or someone else, maybe it sucks that I'm the fastest Cleanser in Hodir fights and I know that people would have died if I hadn't healed them. But you know what, it has helped us kill bosses countless times, and my dps is still up there where I like it to be. So you go ahead and not spec DG for a couple hundred more dps, and when 3 dpsers die to boss AE that you could have mitigated, ask yourself if that couple hundred dps was worth it to you.
Someone do me a favor and do the napkin math of just how much you would gain dpswise with 5/5 Seals of Pure vs 3/5. I want to know how much I'm missing out on.
I reiterate, if you want to simply dps without the worry of healing, shielding, etc, etc, then roll a pure dps class.