The original quote, if I remember from the massive bloat of this thread, had to do with healers standing around in easy content, not healing (because it wasn't needed) and not dpsing either. That was when people in this thread indicated they'd kick a healer.
However a lot of people have also backed off that initial stance because it's important to make a distinction between someone who's basically afk in between casting an occasional heal, and someone who's present and not dpsing because they're new to an instance, or new to healing in FFXIV in general, or new to balancing healing and dps specifically. And it can be hard to recognize the difference.
I had a healer in Dzemael this morning. I'm a BiS tank and I was using cooldowns and souleater combo (self heals). I rarely needed heals. The healer was low fifties and spent most of the time casting unnecessary heals. I looked at their profile and it was the only job they had at that level (and no SC) so I guessed they're a relatively new player and didn't ask them to dps.
It seems like it's worth stating, yet again, that whether a healer can or even should dps depends on the situation. That's really the essence of the conclusion for any dps advocate. And so far I haven't seen anyone disagree.