Is a healer standing around not doing dps, but healing if needed considered griefing or not?

Can't wait for "Just play Ultimate" to have "Just play CC" added on. Somehow that new mode DOES have uses for healers. I mean they need to heal there that's why white mage... wait why can white mage turn me into a pig? That's like... a "stun" basically. Why can something like this not be in PVE?