I know I posted here before, and I'm about to make the same point again, but here goes anyway.

Healers are a type of casting class. Casters should always be casting. Doesn't matter if you're casting heal spells or DPS spells. As long as you're doing what you need to do and not just standing around doing nothing, you're doing your job.

If the tank is taking obscene damage and you're not DPSing, that's fine. If the tank is holding his own and you decide to DPS since the tank doesn't really need much healing, that is also fine!

The problem is when the party isn't getting healed because you're too focused on DPS to care, OR you're so focused on ONLY healing that, when there's nothing to heal, you're not doing anything. That's what's lazy. You have to find the happy medium between healing and DPSing and balance the two. I think that's what the devs intended for Cleric Stance, but it was executed poorly, I feel.