I had that thought when I did my EX rou last night(Ala Mhigo), healer was a WHM and didn't need to heal the PLD all that much(more had to heal us DPS as we were taking agro even using the Diversion/Lucid/whatnot every time we could...but that's neither here nor there) but didn't DPS. We were still ripping things apart rather quickly, so it didn't faze any of us(there was no chat aside from the initial hi from me, then a little later the healer). I'm not sure if it's just the groups people have bad luck with, but I almost never see someone complain about the healer DPSing(or lack there of).