I don't think DPSing in 8 mans is necessarily lazy. I main WHM and if I do Trial roulette and get something ancient where only one healer is needed I assume I am the DPS healer because my output is higher. I used to voice this at the beginning of trial roulette but as I so often get nothing resembling a response I have since stopped unless my cohealer has said something first.

I'm sorry, if I get normal Shiva I am not going to dedicate myself to healing if someone else already is. There is just no need. Is this different from Susano? Absolutely. Still, blanket statements about DPSing healers being bad bugs me.