The role name "Healer" should be changed.

[Veis_Alveare]

Agreed.

They can call it whatever, you're still a healer in the sense that it is your primary responsibility to sustain the group through both unavoidable AND avoidable damage. This is done via healing and this responsibility falls solely on you.

Everyone is a support role in this game, including the DPS.

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.