As a healer, is it my job to DPS? A new perspective.

[Taika]

The thing with that is, as you said, "What matters is how the actual game works", the actual design of game itself is not designed around Healer DPS. It actually matters quite a bit what Yoshi-P has said because he literally explained that no part of the game has been designed with Healer DPS in mind. That means there is no party content in the game designed for you to take part in the battle, so your point that the game is strongly supporting Healer DPS isn't true.

Additional DPS is better and will always be better, but the game isn't designed with it in mind and thus it is not supported in the sense you are claiming.

The game is designed to support healer DPS because all healer jobs have a lot of DPS skills (and Cleric Stance). WHM and SCH also have DPS abilities that directly support their primary role in healing, damage mitigation and MP recovery (Holy, Assize, Shadowflare, Energy Drain). The incoming damage in fights isn't high enough to keep healers busy if they only heal (and it wouldn't make sense to claim that healers are designed just to stand still most of the time when any other job isn't). Additionally, the hardest content in the game requires healer DPS for clears when it's added - no matter what Yoshi said. There are also mechanics in casual dungeons that are clearly designed with DPSing healer in mind (for example in Antitower when DDs are turned into dolls - if tanks and healers won't DPS them and instead just "heal" and "tank", the whole party dies, and yes it's 2 DDs every time, it's scripted). These all prove that the game design in fact strongly supports DPS as a part of healer's role.