The role name "Healer" should be changed.

[Gemina]

Your primary responsibility as a healer is to clear the instance by killing the enemies, same as anyone else. The only difference is you have comparatively more skills that restore HP.

Spin it how you want. It's still your primary responsibility to sustain the group, and DPS stops when heals are needed. Period. Number of skills is entirely irrelevant, but if you want to go there you might want consider not how many more healing skills you have opposed to DPS abilities, but rather how many/few of those abilities you have in respect to the other members of your group.

No matter if your perspective is "I DPS until it's time to heal" or "I DPS when heals aren't needed." you're still cut from the same cloth. So please stop wasting your time trying be right.