Offtopic:
I main SCH and I actually impressed how bad an opinion of SCH healing exists. I experience it in A3S We had last week 2 PUGs helping us out and at one pull the Digitis was derped so our WHM (we have WHM solo until adds) ended up with the healing potency down and I heard on TS from one of the PUGs "This gonna be hard on the SCH". It was during 2 hands phase. Well yes it is not the easiest if you are that very moment using Selene and SCH AOE heals all rely on your stacks (3/min, Indom has 30s CD) and Emergengy Tactics (30s CD) but still not a unmanageable task >.<
A scholar that doesn't know to heal is not worth being called healer.

On topic:
If a fight has large parts where you need almost no healing why not have one healer DPSing? It must happen in agreement though.
I personally only get sad if people ask me to soloheal some parts and then don't even know how to DPS or drop Cleric the moment I see a safe moment to go full burst. Even in a soloheal I am allowed to put DPS but if you leave your coheal soloing unannounced that is not fair.