It would have been nice for you to put legitimate numbers into this on say average dungeon monster kill times with/without healer dps'ing vs amount of heals it would save doing so. Not arguing your point at all, would have just been interesting to see.

I don't think many people would argue that a healer would be more effective if he/she were to DPS as well. What I think the argument comes from is healers feeling that they are being picked on to be expected to do more then other classes for the mindless daily dungeons.

As for myself personally, I would say about 90-95% of the time I DPS in content as a healer. That's what I do. However I completely support healers who do not. Why? Not because I feel as though they can't do better, but because the average DPS and Tank are not doing anywhere near their best either, from my experience.

With that being said, I do think it's somewhat unfair to expect optimization from a role but not from the others. I almost never see any threads about lazy DPS or Tanks who are not using their abilities and rotations (I'll leave rotations out, abilities alone lets say) as they should. I would argue if they did, perhaps the monster would die just as fast as if the white mage helped DPS. Imagine if they were ALL held accountable! Monsters would die so fast!!! But again, with of course exceptions, I don't see the DPS or Tanks doing anywhere near their best, so why is there an urge to call out the healers? Simply because it's more noticeable visually.

So sorry, despite my own personal play style of DPS'ing in content, I will never jump on board with healers being expected to DPS. Not while the other roles are not being called out.